Mackinaw
Member
......When I get a few more minutes, I'll respond to questions/comments directly.
What type of chemistry can be used to process this new P-30 B&W film? And how about development times?
Jim B.
......When I get a few more minutes, I'll respond to questions/comments directly.
What type of chemistry can be used to process this new P-30 B&W film? And how about development times?
It looks like my guesses were correct that that first coating was indeed P30! Although others claimed here that it did not look "panchromatic"
I claimed that based on the first shot (the one with the horses).
But after looking at the other sample pictures, it looks as panchromatic as human eyes.
Each frame is a piece of jewerly!
The 5 g/m figure for silver is in the high end of present B&W films but not unreasonable. To me it indicates possible desire for high contrast, reversal processing or perhaps just low chemical sensitization
PE
What does a high silver content mean for a black and white film? I see it mentioned commonly with reversal suitable films but what does it do/change?
The other thing could very well be the fact that they are following the original formula.The 5 g/m figure for silver is in the high end of present B&W films but not unreasonable. To me it indicates possible desire for high contrast, reversal processing or perhaps just low chemical sensitization.
PE
Well as it turned out, they needed to make a simple B&W emulsion for testing the coater, and they must have thought they may as well try P30, (does not surprise me, as its quite obvious Nicola has been dying to get his hands on the stuff!I swear I saw an FAQ about Ferrania not planning on making a BW film a few months ago, I guess they changed their minds![]()
I swear I saw an FAQ about Ferrania not planning on making a BW film a few months ago, I guess they changed their minds![]()
What does a high silver content mean for a black and white film? I see it mentioned commonly with reversal suitable films but what does it do/change?
PE thank you for the clarification! still looking for those silver rich films!! I"m looking forward to try the P30 film but my trusty TMY400 stays in the bag!!Early methods of sensitizing silver left dead grains which were useless. These were called "high silver" or "silver rich" materials. As technology improved, the process for sensitizing became better and silver levels were decreased. As they were, grain went up but so did sharpness and thus, they made finer grains at the same speed. (following me so far?). Thus, today's films are finer grained but lower silver with better sharpness and equal or higher speed. Today, about 300 mg would equal 500 - 1000 in days gone bye (mg/ft square).
So, there it is simply.
PE
Early methods of sensitizing silver left dead grains which were useless. These were called "high silver" or "silver rich" materials.........
Early methods of sensitizing silver left dead grains which were useless. These were called "high silver" or "silver rich" materials. As technology improved, the process for sensitizing became better and silver levels were decreased. As they were, grain went up but so did sharpness and thus, they made finer grains at the same speed. (following me so far?). Thus, today's films are finer grained but lower silver with better sharpness and equal or higher speed. Today, about 300 mg would equal 500 - 1000 in days gone bye (mg/ft square).
So, there it is simply.
PE
Sheet film version one day would be nice, too!
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