Tornant a La Salut
IN ENGLISH BELOW THE LINE
Placa de col•lodió sec, mètode Sutton (Rapid Dry Collodion), en format 4x5; realitzat amb una Graflex Crown Graphic fabricada cap al 1949; objectiu Kodak Anastigmat f4.5; col•lodió barreja i goma aràbiga; 25 segons a f8.
Després de les plaques de col·lodió sec de Major Russell, el pas obvi i fàcil son les plaques "ràpides" de Thomas Sutton, qui va descriure aquest procés ja el 1862. És realment facil perque l'unic canvi consisteix en substituir el taní com a conservant per goma aràbiga. La sensibilitat s'incrementa notablement.
Per desgracia, hi ha un problema en mirar en detall les plaques preservades segon Sutton: hi ha tot un petit reticuat que cobreix tota la emulsió, com si fos una esponja. També apareix, segons com, un seguit de regalims de la emulsió que no son gens desitjables.
studioq.com/blog/2022/2/14/the-rapid-dry-plate-process-by...
Fotografies realitzades al entorn del santuari de La Salut, a Sabadell.
==========================
Dry collodion plate, Sutton process (Rapid Dry Collodion) in 4x5 format; taken with a Graflex Crown Graphic, made c. 1949; Kodak Anastigmat f4.5 lens; re-used collodion and gum arabic; exposed for 15 s. at f5.6.
After Major Russell's tannin dry collodion plates, the obvious and easy step is Thomas Sutton's "rapid" plates, described in 1862. It's really easy because the only change is to replace tannin as a preservative with gum arabic. The sensitivity is noticeably increased (although maybe just a bit slower than wet plate). Here it would have needed about 3 minutes with only tannin added, and maybe about 45 seconds. including 25-50% gum arabic. But with just gum, I was able to do this dry plate in 15 seconds, and I could probably get it down to 12. With a bright lens I can do a portrait in about 5 or 6 seconds.
Sadly, at least till now, an ugly yet continuous sponje-like pattern appears all along the emulson. Maybe with newer collodion.There are also some nasty-looking trickles
studioq.com/blog/2022/2/14/the-rapid-dry-plate-process-by...
Pictures taken arround the church of La Salut, the patroness of my hometown, Sabadell, and where my parents got married.
Tornant a La Salut
IN ENGLISH BELOW THE LINE
Placa de col•lodió sec, mètode Sutton (Rapid Dry Collodion), en format 4x5; realitzat amb una Graflex Crown Graphic fabricada cap al 1949; objectiu Kodak Anastigmat f4.5; col•lodió barreja i goma aràbiga; 25 segons a f8.
Després de les plaques de col·lodió sec de Major Russell, el pas obvi i fàcil son les plaques "ràpides" de Thomas Sutton, qui va descriure aquest procés ja el 1862. És realment facil perque l'unic canvi consisteix en substituir el taní com a conservant per goma aràbiga. La sensibilitat s'incrementa notablement.
Per desgracia, hi ha un problema en mirar en detall les plaques preservades segon Sutton: hi ha tot un petit reticuat que cobreix tota la emulsió, com si fos una esponja. També apareix, segons com, un seguit de regalims de la emulsió que no son gens desitjables.
studioq.com/blog/2022/2/14/the-rapid-dry-plate-process-by...
Fotografies realitzades al entorn del santuari de La Salut, a Sabadell.
==========================
Dry collodion plate, Sutton process (Rapid Dry Collodion) in 4x5 format; taken with a Graflex Crown Graphic, made c. 1949; Kodak Anastigmat f4.5 lens; re-used collodion and gum arabic; exposed for 15 s. at f5.6.
After Major Russell's tannin dry collodion plates, the obvious and easy step is Thomas Sutton's "rapid" plates, described in 1862. It's really easy because the only change is to replace tannin as a preservative with gum arabic. The sensitivity is noticeably increased (although maybe just a bit slower than wet plate). Here it would have needed about 3 minutes with only tannin added, and maybe about 45 seconds. including 25-50% gum arabic. But with just gum, I was able to do this dry plate in 15 seconds, and I could probably get it down to 12. With a bright lens I can do a portrait in about 5 or 6 seconds.
Sadly, at least till now, an ugly yet continuous sponje-like pattern appears all along the emulson. Maybe with newer collodion.There are also some nasty-looking trickles
studioq.com/blog/2022/2/14/the-rapid-dry-plate-process-by...
Pictures taken arround the church of La Salut, the patroness of my hometown, Sabadell, and where my parents got married.