sidearm613
Member
Here you go, sourced from an article written by Sandy King about pyro developers, in particular Pyrocat:
(ehem, and I quote)
"image stain is produced in those areas of the negative where silver is being reduced, and this stain is proportional to the amount of silver: least in the shadows where there are areas of low silver density, greatest in the highlights. Since the exposing light sees the stain as increased printing density, total negative density is equal to the combined silver and stain densities. The result is that the stain masks film grain by filling in between silver grains, resulting in both increased acutance and finer tonality in the final print. This effect is seen in negatives of all sizes but the impact is particularly dramatic in 35mm and roll film formats."
and the URL, for further reading...
http://unblinkingeye.com/Articles/PCat/pcat.html
(ehem, and I quote)
"image stain is produced in those areas of the negative where silver is being reduced, and this stain is proportional to the amount of silver: least in the shadows where there are areas of low silver density, greatest in the highlights. Since the exposing light sees the stain as increased printing density, total negative density is equal to the combined silver and stain densities. The result is that the stain masks film grain by filling in between silver grains, resulting in both increased acutance and finer tonality in the final print. This effect is seen in negatives of all sizes but the impact is particularly dramatic in 35mm and roll film formats."
and the URL, for further reading...
http://unblinkingeye.com/Articles/PCat/pcat.html
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