View allAll Photos Tagged Absorption
A hook is attached to one end an absorption tower during its unloading off of the ship Thorco Clairvaux at the France Road Wharf in New Orleans on Saturday, May 17, 2014. (Photo by Peter G. Forest)
Dock workers place some cables onto a giant hook that is attached to a crane during the unloading of an absorption tower off of the ship Thorco Clairvaux at the France Road Wharf in New Orleans on Saturday, May 17, 2014. (Photo by Peter G. Forest)
Sonata Vario Acoustic Absorbers Installed to the ceiling at at Kirkby Lonsdale Methodist Chapel to reduce reverberation with the side room.
www.soundreduction.co.uk/Products/Sound-Absorption-Soluti...
Operation of atomic absorption spectrometer in analytical laboratory
Obsluha atomového absorpčního spektrometru v analyzační laboratoři
Color of Life note
Biofluorescence results from the absorption of electromagnetic radiation at one wavelength by an organism, followed by its reemission at a longer and lower energy wavelength, visually resulting in green, orange, and red emission coloration. Many species of mantis shrimp, for example, make use of fluorescent body parts when in threat display in order to intimidate or confuse either a predator or a competing male.
Ref: Color sources, California Academy of Sciences Docent program May 2015
PLOS one Biofluorescence journals.plos.org/plosone/article?id=10.1371/journal.pone...
TAXONOMY
Kingdom: Animalia
Phylum:Arthropoda
Subphylum: Crustacea
Class: Malacostraca
Order: Stomatopoda
Family: Odontodactylidae
Genus/species: Odontodactylus scyllarus
GENERAL CHARACTERISTICS: Beautifully colored in peacock colors of greens, blues, and reds. Has a green body, blue head, green antennal scales, red limbs. The body is elongated with a long, flattened , blue tail and ranges in size from 3–18 cm (1.2-7.0 in). Highly noticeable is the pair of clubbed-shaped, praying mantis-like claws.
DISTRIBUTION/HABITATS: Indo-Pacific Habitat: warm salt water and builds U-shaped burrows in gravel substrates. Depth ranges from 3-40 m (10-131 ft).
DIET IN THE WILD: Feeds on other shrimp, worms, snails, crabs, mollusks. Lies in wait for prey in front of burrow, then swims out and quickly crushes prey with a strong, powerful smash. The claw moves so quickly it generates cavitation bubbles, which explode with a second powerful burst. The speed with which the claw moves through the watergenerates a force 100 times the shrimp’s body weight.
REPRODUCTION: Monogamous. O. scyllarus mate, spawn, brood, and hatch their eggs in their burrows.
LONGEVITY: Often live in pairs for their entire lifetime (4-6 years).
PREDATORS: Yellow Fin tuna
CONSERVATION: IUCN Not Evaluated
REMARKS: Large peacock mantis shrimp generate forces powerful enough to crush the shell of a large conch, and have been known in captivity to break the glass of their tanks! Striking speed of 50+ mph.
The amazingly complex eyes of mantis shrimp detect 12 base colors (compared to our 3). They also can discern ultraviolet, infrared frequencies, and the polarization of light!
Water Planet Sensing AQJ16
References
California Academy of Sciences Steinhart Aquarium Water Planet, Senses Cluster (Sight) 2016
Animal Diversity Web animaldiversity.org/accounts/Odontodactylus_scyllarus/
Ron's Wordpress shortlink wp.me/p1DZ4b-We
Ron's flickr www.flickr.com/photos/cas_docents/sets/72157608602469734/
9-8-11, 4-22-13, 8-17-15, 2016
Two natural uncut emeralds and a Gilson synthetic cut stone. Like ruby and red spinel, emerald is coloured by chromium. Emerald contains beryllium as an integral part of its crystalline structure (Be_3 Al_2 (SiO_3)_6). Beryllium is a uniquely interesting element since, during the evolution of the universe from the Big Bang, it was not produced by nuclear reactions in stars and supernova explosions like most of the other chemical elements but by the interaction of cosmic rays with interstellar gas between the stars.
Pulse oximeters measure light absorption in the finger to noninvasively monitor oxygen saturation and pulse rate.
www.amazon.com/Masimo-Oximeter-Connector-Sensor-Android/d...
Following the Citybus absorption of the New World First operation in 2023, the oldest members of the NWFB Enviro 500 fleet were taken out of service and stored, including all 18 of the initial 12m batch dating from 2008. In an unusual move, a solitary example was returned to service and is often found on the Cross-Harbour 110, as was the case in this view of 5513 turning from Chatham Road South into Cheong Wan Road, Tsim Tsa Tsui.
This image is copyright and must not be reproduced or downloaded without the permission of the photographer.
Origin: Damasraya, West Sumatera
The three 404nm laser-excited spectra illustrate the effect of self-absorption of the fluorescence signal since the red amber absorbs the blue light so strongly even from a shallow depth.
Infrared spectroscopy (green line) of a biodegradable 'plastic' cup, seen in the centre of the photograph, compared with two samples of conventional clear plastic food-wrapping boxes (red and brown line spectra).
The cup is made from corn starch converted to polylactic acid (PLA): see: en.wikipedia.org/wiki/Polylactic_acid
The PLA shows a rich blue fluorescence under LW (UVa) light in contrast with the plastic that glows a pale greenish white.
This annotates the telluric absorption features in the sunset and Lunar eclipse absorption spectra. It shows that the water and dimer (O_4) absorptions are much weaker in the eclipse (Pallé, E. et al. Nature volume 459, pages 814–816 (11 June 2009)) spectra since this samples predominantly the upper atmosphere where these species are rare. The dimer bands require a temporary pairing of oxygen molecules and so their relative abundance depends on the pressure.
An interesting discussion of the effect of ozone on sunrise and sunset sky colour is given by Frédéric Zagury and Mitsugu Fujii (New Astronomy, 2003, 8, p.549-556 ), available at :
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Just like a bodybuilder, Buzzwole is often seen striking poses that show off its massive, abnormally swollen muscles. The creature’s body covered in red blood-like filled sacs with veins that are said to be as hard as steel. Buzzwole’s crushing power and unbridled rage give way to fearsome physical damage, and worst of all, a stabbing attack from its silver proboscis which can drain and steal opponents’ energy! This giant extra-dimensional anthropomorphic mosquito packs quite a pulverizing punch!
Built for the Ultra Beasts Collab! Find the other powerful Ultra Beasts from these talented builders!
@_ezreel_ as Nihilego
@anderson_builder as Buzzwole
@dv_mocs as Pheromosa
@carecreations_ as Xurkitree
@aidan_jh as Celesteela
@rons_oc as Kartana
@petersheikah as Guzzlord
@space_glove as Nekrozma
@panuvara as Naganadel
@danielbrickson as Stakataka
@brick_diamonds as Blacephalon
AirDrain Agronomic Natural Grass Drainage at the Chesapeake Energy Roof Top Sports Field
74,000 sqft. Natural Grass Field
Benefits of AirDrain in a green roofing system include:
AirDrain creates and helps maintain a constant Gmax for artificial turf (See below)
Thickness and resin consistency of AirDrain provides uniform shock absorbency
Shock absorption reduces the strain on joints and ligaments
AirDrain is only limited by the drainage capacity of the profile above it
Installation time measured in days instead of weeks
AirDrain can be reused when the artificial turf must be replaced
Water harvesting reclamation and reuse
Helps qualify for LEED and other green building credits
A smaller carbon and development footprint with reduced site disturbance
100% vertical drainage under the entire field surface
Minimizes water related injuries / Less infill migration due to superior drainage
AirDrain is a 100% recycled product
Less infill migration due to superior drainage
GMAX Information Existing Conditions for Testing
Turf - 2 1/2” Slit Film, in filled with 50% Green Rubber Infill and 50% Silica Sand.
The drainage/shock pad and turf underlying substrate consists of a concrete deck/rooftop, coated with a waterproof membrane and 10 ounce 100% recycled polyester geo-textile filter fabric.
The Standard Test Method for Shock-Absorbing Properties of Playing Surface Systems and Materials (ASTM F1936-98 American Football Field) testing locations and procedure were preformed. The tests were performed using a Triax 2000 A-1 Missile, tripod mounted Gmax registration unit(www.triax2000.com). This report presents background information on the test procedures, existing conditions, test results and observations in football, baseball, softball, soccer, lacrosse, and field hockey artificial sports fields.
The environmental impact of a green roof is undenyable, and adds significantly to the LEED Point system designed by the USGC in all five major areas: sustainable site development, water savings, energy efficiency, materials selection, and indoor environmental quality. Green roofing replaces the green space displaced by a building, prevents excess storm water drainage, reduces the temperature of a building and the urban heat island effect, protects and extends the useful life of a roof, and reduce energy demands.
What's more, a green roof incorporating AirDrain means your design includes renewable, recycled, and locally obtained materials. We know you have a choice in designing a green roof, and we hope you consider the many benefits of AirDrain.
A typical AirDrain green roof
A lot of people will suffer from the pain sensation and inflammation of hemorrhoids one or more times. Women that are carrying unborn children have a tendency to develop them routinely, both pre and post the birth. Both sexes can contract them from straining a lot of as a result of constipation. This article below provides some excellent guidelines to help you avoid this common condition.
Should you experience hemorrhoids, maintain the area clean. Moistened wipes are superior to using toilet paper as it is more at ease. The swelling and pain due to hemorrhoids may be relieved by warm sitz baths. You should sit within it for 20 minutes at the very least.
Aid the prevention of the growth of external hemorrhoids by boosting your bathroom hygiene. Pick a soft toilet paper and utilize moistened wipes after your bowels.
Rutin may help you along with your hemorrhoids. Sometimes hemorrhoids appear because of bloodstream that are not very strong. The appropriate absorption of Ascorbic Acid is vital for maintaining strong, healthy bloodstream and also the flavonoid Rutin is vital for proper absorption. It is located in certain vegetables and citrus fruit. Should you would rather consume it in supplement form, make an effort to take 500 mg every single day.
The effective use of ice then heat is a straightforward as well as simple do-it-yourself solution for hemorrhoids. Should you alternate between applying ice and also heat, it is possible to promote quick healing. First, put ice in the hemorrhoid for 10 mins, then immediately followup with twenty or so minutes of moist heat.
Should you suffer from hemorrhoids, it is prudent in order to avoid using personal care products who have irritants, including dyes, scents or essential oils, in the area surrounding your hemorrhoids. Accidental being exposed to these substances can be quite a fast track to increased amounts of stinging and swollen tissues.
Utilize ice to relieve hemorrhoid pain. Hemorrhoids could cause an excellent little pain. Should you apply an ice pack in the area, it is going to relieve a number of the swelling and present some pain alleviation. For ever better results, alternate between an ice pack as well as a heat pack. It is possible to decrease the volume of swelling and stinging, by letting yourself to soak within a tepid sitz bath. Between soaks, apply a homemade ice pack for the involved area.
Since the above article has demonstrated, a lot of people could have hemorrhoids sometime inside their lifetime. Most of these men and women will repeatedly suffer with this challenge. This disorder may be handled through exercise and healthy diet. hemoroides.net/
Bill (1982, www.unige.ch/sciences/chifi/publis/refs_pdf/ref00761.pdf ) demonstrated that the yellow colour of natural fluorite is due to a broad absorption, centred at 440nm, that results from an O3- colour centre (an O3 negative ion replacing two fluorine ions in the CaF2 fluorite structure). While this centre is not locally charge neutral, the charge can be compensated by Na+, Gd3+ and Yb3+ impurity ions.
The O3- produces a vibronic, 'glove-shaped' absorption band with about 8 'fingers' apparent in the transmission spectrum of ~1cm of crystal. The positions of the fingers are not strongly dependent on the nature of the cation in the crystal and Bill compared measurements of O3- in an argon matrix with the finger wavelengths in fluorite. His two sets of fluorite measurements are shown as red and black points marking the band absorption maxima in the plot.
This plot shows three independent measurements (with two spectrometers) of the transmission spectrum of a sample of yellow flourite from the Hilton mine in Cumbria, UK (see the two previous posts). These data have been transformed to absorbance per cm pathlength with the usual uncertainties of scale associated with the internal scattering in the imperfect sample and the difficulty of calibrating the transmission scale. All three measurements show the same pattern of absorption maxima given by Bill.
This O3- molecular ion, known as an ozonide, might be expected to have properties related to its gaseous cousin ozone, notwithstanding their very different local environments. The plot here includes the absorbance spectrum of the atmospheric Chappuis band of ozone corresponding to a pathlength of 8cm (chosen simply to compare at similar scales). The very similar vibronic structure is apparent. This atmospheric absorption band is the dominant physical effect in determining the colour of the twilight sky and is responsible for the very blue light during the hour before sunrise and after sunset commonly referred to by artists as "The Blue Hour". Here we have a beautiful yellow crystal exhibiting an absorption band of similar shape and structure which is shifted from the orange to the deep blue part of the spectrum, resulting in its complimentary colour.
This work was done in collaboration with Cran Cowan.
Line graph showing the relative amounts of light absorption at different light wavelengths of the photosynthetic pigment family known as the Cryptochromes. Feel Free to use the photo but please don't forget to give credit to www.ledgrowlightshq.co.uk.Thanks!
AirDrain Agronomic Natural Grass Drainage at the Chesapeake Energy Roof Top Sports Field
74,000 sqft. Natural Grass Field
Benefits of AirDrain in a green roofing system include:
AirDrain creates and helps maintain a constant Gmax for artificial turf (See below)
Thickness and resin consistency of AirDrain provides uniform shock absorbency
Shock absorption reduces the strain on joints and ligaments
AirDrain is only limited by the drainage capacity of the profile above it
Installation time measured in days instead of weeks
AirDrain can be reused when the artificial turf must be replaced
Water harvesting reclamation and reuse
Helps qualify for LEED and other green building credits
A smaller carbon and development footprint with reduced site disturbance
100% vertical drainage under the entire field surface
Minimizes water related injuries / Less infill migration due to superior drainage
AirDrain is a 100% recycled product
Less infill migration due to superior drainage
GMAX Information Existing Conditions for Testing
Turf - 2 1/2” Slit Film, in filled with 50% Green Rubber Infill and 50% Silica Sand.
The drainage/shock pad and turf underlying substrate consists of a concrete deck/rooftop, coated with a waterproof membrane and 10 ounce 100% recycled polyester geo-textile filter fabric.
The Standard Test Method for Shock-Absorbing Properties of Playing Surface Systems and Materials (ASTM F1936-98 American Football Field) testing locations and procedure were preformed. The tests were performed using a Triax 2000 A-1 Missile, tripod mounted Gmax registration unit(www.triax2000.com). This report presents background information on the test procedures, existing conditions, test results and observations in football, baseball, softball, soccer, lacrosse, and field hockey artificial sports fields.
The environmental impact of a green roof is undenyable, and adds significantly to the LEED Point system designed by the USGC in all five major areas: sustainable site development, water savings, energy efficiency, materials selection, and indoor environmental quality. Green roofing replaces the green space displaced by a building, prevents excess storm water drainage, reduces the temperature of a building and the urban heat island effect, protects and extends the useful life of a roof, and reduce energy demands.
What's more, a green roof incorporating AirDrain means your design includes renewable, recycled, and locally obtained materials. We know you have a choice in designing a green roof, and we hope you consider the many benefits of AirDrain.
A typical AirDrain green roof
Sonata Duo high performance acoustic absorbers suspended from the ceiling within a classroom at Manorfield School, Central London. Sonata Duo was used to meet the reverberation criteria of BB93 for Schools.
www.soundreduction.co.uk/Products/Sound-Absorption-Soluti...
- MERINO sheepskin lining offers all of the advantages of wool over synthetic fibers, providing efficient shock absorption and superior thermal comfort. Sheepskin contains lanolin, a natural substance, which soothes the horse's sensitive or inflamed skin. When sheepskin is set directly against the animal's body, it stimulates blood circulation and promotes a therapeutic effect.
- The Non-Slip mesh upper assures perfect grip and steadily secures the MerinoLUX Half-Pad under the saddle.
- Breathable 3-Dimensional Spacer fabric reduces heat build-up and provides excellent moisture vapor transfer.
- The black non-slip mesh is not visible under the saddle, conforming to the FEI rules and regulations.
- Optimum thickness of the MerinoLUX Half-Pad does not compromise the fit of the saddle.
A couple of dock workers attach a hook onto an absorption tower so that it can be unloaded off of the ship Thorco Clairvaux at the France Road Wharf in New Orleans on Saturday, May 17, 2014. (Photo by Peter G. Forest)
The shows the use of an Ocean Optics USB4000 digital spectrometer to obtain a blue-UV spectrum of a clear blue sky at sunset. Such spectrometers are used extensively for atmospheric measurements - especially for the study of gases in volcanic plumes such as sulphur dioxide and bromium monoxide that have absorption bands in this spectral region.
The blue line spectrum here was obtained in Munich during the evening of the 22 August 2014 using an optical fibre pointed towards the NE at an altitude of about 60°. What is plotted is the ratio of the sky spectrum when the Sun was on the horizon to the spectrum obtained earlier with a Solar altitude of 19°. Such a ratio will remove most (but see below) of the Solar (Fraunhofer) spectral lines and leave what we call the 'telluric' spectrum: the extinction caused by the passage of the Sunlight through the Earth's atmosphere.
This telluric spectrum has been modelled (orange line) using the published X-sections (absorption coefficients) of the molecules O3 (ozone), NO2 (nitrogen dioxide) and O4 (the Collision Induced Absorption produced by the O2.O2 'dimer'). There is also a smooth spectral slope produced by the molecular (Rayleigh) scattering by molecules and the Mie scattering produced by aerosols: this has been modelled over this spectral range using a simple power-law in wavelength. Note that the observed (blue) spectrum has been shifted upwards by 0.1 transmission units for clarity of presentation.
The 'rippled' cut-off below 350nm is caused by the Huggins band of ozone - the gas that protects us from hazardous UV radiation. Ozone also has a much weaker absorption , the Chappuis band, that has some effect at the longest wavelengths in this spectrum. The nitrogen dioxide, in this case probably a pollutant produced by engine exhausts around the city, is apparent as the haze of weak absorption bands mostly between about 400 and 500nm. The O4 only has a small effect here at a wavelength of 476nm.
The two most obvious discrepancies between the observation and the model are marked with the pink rectangles on the plot. On the left, the two strong Fraunhofer lines (H & K) produced in the Solar atmosphere by ionized calcium appear in 'emission' in the ratio spectrum. This is due to Raman scattering on the Earths atmosphere, a process called the 'Ring effect' that has been discussed in another of my posts. The one on the right is produced by a weak absorption band of water between 500 and 510nm that is not included in this model: the strong water bands are further to the red.
A simple model of this kind produces estimates of the column densities of molecular absorbers and scatterers that affect the transfer of light through the atmosphere.
During the passage of the remnants of hurricane bertha across Munich at 10:30 local time on the 11th August 2014, I obtained a spectrum of the relatively heavy overcast sky. The spectrometer fibre was pointed at an altitude of about 60° towards the NE. Using the same process as for the thundercloud reported in a recent post, I can show that the photon pathlength within the cloud in this case is around 30km rather than the over 100km seen in the thundercloud.
The water absorptions, while strong, are also weaker than in the thundercloud. The cloud is still bluer than direct sunlight but the spectrum has a shallower slope in the visible spectrum with a power-law* slope of approximately -1.1 (cf -2 for the thundercloud and -4 for Rayleigh scattering).
The brightness ratio at 600nm of this spectrum to the thundercloud is measured to be 23.5.
Another interesting thing to note in these spectra is that the CaII H & K absorption lines (the strong doublet between 390 and 400nm) appear weakly in 'emission' in the ratio spectrum. This is due to the 'Ring effect'. The light scattering of sunlight from air molecules in the atmosphere is mostly elastic (no wavelength change): the Rayleigh scattering that makes the blue sky. A small fraction of the photons, however, scatter inelastically giving (usually) energy to the molecule and producing scattered light that is a bit redder. This is called Raman scattering - after the first Indian Nobel laureate in physics, Sir C V Raman - which is able to take light from brighter parts of the spectrum and transfer some of it into the absorption lines and so making them shallower. When you take the ratio of this to the direct light from the Sun, the lines show up apparently in 'emission'. This is seen clearly in this and in the thundercloud spectrum.
*although the power-law is not such a good fit in this case (except in the middle of the visible spectrum).
SoTru® OrganicChlorella is a nutrient-rich superfood that provides essential vitamins, minerals, fatty acids, amino acids, nucleic acids (RNA and DNA), chlorophyll and a broad spectrum of phytochemicals. We know what you’re thinking and we agree. By the name alone you’d never guess it was so good for you. The many health benefits of Chlorella include: natural detoxification, supporting brain and heart health, enhancing immune function and improving digestive health. Chlorella really cares about you. On the inside, because isn’t that what’s most important?
A "Versabar" lift apparatus is being used during the unloading of an absorption tower off of the ship Thorco Clairvaux at the France Road Wharf in New Orleans on Saturday, May 17, 2014. (Photo by Peter G. Forest)
Absorption spectrum of the sky made with my DIY spectroscope. A 650 nm red laser spectrum is overlapped for reference.
Gone are the days of CKPR (Cockermouth Keswick and Penrith Railway), before absorption into the LMSl and grouping.
The LNWR had running powers over the line for many years before grouping in 1923, but did not absorb the CKPR: click here... ... for Wikipedia article.
Originally a full station yard, 3 platforms, 4 tracks (one passing); quite a set up. Now a deserted platform used as part of the adjoining CKPR built railway hotel.
And now.... - just a lone platform part subsumed into the original CK&PR hotel, surrounded by a car park.
(Photo taken 2006_05_24)
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Of limited interest I accept. this plasterboard panelling is slotted to provide acoustic absorption. It means that the huge Grand Arcade shopping mall in Cambridge doesn't sound like a toilet. It is often seen in atria, and is being increasingly used as corridor ceilings in schools, and communal corridors in housing.
Scored myself some sound proofing as the doors of the Aygo are quite flimsy. Sounds proofing will make the music sound better and make for a better driving experience.
Info:
Camera: Sony Xperia Z3
The ring silicates (cyclosilicates) iolite, beryl and tourmaline have crystal structures that contain channels large enough to house individual impurity molecules which can exhibit spectral properties similar to their normal vapour forms. These three minerals typically contain molecules of water that show infrared absorptions that are both narrower and at a shorter wavelength than liquid water (shown as the broad blue band in the plot here). The trapped molecules in these channels can remain 'bottled up' for periods as long as the age of the Earth and can sometimes be sampled to reveal magma histories from very early in the history of our planet.
The images of rough crystals above are, from the left, iolite, emerald and pink tourmaline. The strong water absorption bands can be seen around 1400 and 1900nm.
Sonata Vario Absorbers Installed to the ceiling at Park Central Restaurant, York Science Park.
www.soundreduction.co.uk/Products/Sound-Absorption-Soluti...
Taken in 2014 at a panorama and photoshop clinic run by my friend Rob and his business partner Peter (standing at rear)
Even though the light was appalling I had to get this shot of the student and his enthusiastic concentration!
Sonata Duo high performance acoustic absorbers suspended from the ceiling within a classroom at Manorfield School, Central London. Sonata Duo was used to meet the reverberation criteria of BB93 for Schools.
www.soundreduction.co.uk/Products/Sound-Absorption-Soluti...
Spread butter evenly on bowl walls for maximum surface area. This allows for better smoke absorption.
Bird lovers, listen up! There is finally a way to soundproof a bird cage safely and effectively, without jeopardizing the happiness of your pet. Audimute Sound Absorption Sheets can be used to cover 2 sides of a bird cage, as well as a couple walls and even the doorway. They're portable and easy to hang and remove. By absorbing the mid and high frequencies, Sound Absorption Sheets make the screaming of birds tolerable, which in turn allows you to train them that there are other ways of getting your attention.
Visit audimutesoundproofing.com or quietparrothappyowner.com to learn more. If you want to discuss your own application, give us a call at 866-505-MUTE!
Workers use straps to bring the cables down to place on the hooks so that the absorption tower can be unloaded off of the ship Thorco Clairvaux at the France Road Wharf in New Orleans on Saturday, May 17, 2014. (Photo by Peter G. Forest)
It never occurred to me that it might not be, so I've already tried it out and shot some sunspots with it. But then I started reading all the terrible warnings about not using a real solar filter, risking melting my camera sensor, and so on, because ordinary photographic ND filters didn't necessarily stop IR, just visible light. I also discovered that those few ordinary photographic ND filter makers who bother to specify IR transmision specify it being blocked as well as the visible light. Plus a few knowledgeable optical lab people who said that at least most ordinary ND filters were also IR safe. So I googled for tales of people melting their cameras etc. by ignorantly using an ordinary ND filter to photograph the sun. All I could find were stories of people who had caused damage by obvious stupidity, such as not using any filter at all, or mounting the filter at the end of the optical path instead of the beginning.
I'm starting to suspect all these dire warnings about ordinary photographic filters may be no more then urban rumours propagated by people who don't know and have no confidence in their own native ability to find out.
To get an initial feel for the IR blocking capabilities of my XCSource big stoppers I measured the temperature of a small portable gas soldering iron bit using a remote temperature sensor. It measured 241 degrees C. I then put the big stopper in between the tip and the sensor. The temperature measured the ambient room temperature, not even a tenth of a degree above.
So far so encouraging! But not conclusive. More experiments later.
Original: DSC09935X