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Detail of a leaf.
The average rate of energy captured by global photosynthesis is approximately 130 terawatts, which is about eight times the total power consumption of human civilization. Photosynthetic organisms also convert around 100–115 billion tons of carbon into biomass per year. [from Wikipedia]
Scanned salt print
Arches Aquarelle. High contrast dig neg without salt print calibrated curve + reduction of exposure time to 4 min.
Everything else as previously uploaded "Monte Baldo" print.
I suspect that exposure time and neg density has a great influence on salt print tone.