ADVANCED EMULSION: Silver Halide Crystals, Imaging Couplers, Orange Masks and Processing-YouTube

MattKing

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This came to my attention, and it seems excellent!
 

koraks

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It's always humbling to read/hear about how color emulsions work, I find. There's so much R&D and intelligence that went into it. It's really amazing.

I liked the part on the orange mask as it is all too often misunderstood that the orange mask is not only constant - there's also an exposure-dependent part to it.
 

cmacd123

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yes, it does seem to capture the process, at least for movie film. Still colour Negative has a different way for doing the Anti-halo.

this again shows rather clearly how the Orange colour is really your friend.
 

DREW WILEY

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It's yellow-orange anyway, except when it's more red-orange, or simply orange. I'll settle on tangerine; or is it apricot? Fun video.
 
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pwadoc

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I was looking at the datasheet for Fuji Crystal Archive, and interestingly it appears to have a giant hole of zero sensitivity at around 600nm, which is orange light. I bought an array of orange LEDs and tested them with a spectrophotometer, and I'm going to test them with some strips of Crystal Archive and see how accurate that datasheet is. Kodak Endura also has a weak area around 600nm, but it's still sensitive, so probably not as use for that emulsion.
 

Dirb9

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To make it simpler for your testing, the dip in sensitivity for color paper is designed around the spectral emission of a low pressure sodium vapor lamp: https://en.wikipedia.org/wiki/Sodium-vapor_lamp, at 589-590nm. The few color LED safelights out there used leds with peaks at the same point. Do keep in mind that too bright or too long an exposure to a safelight will fog your paper, regardless of the wavelength of the light.
 

pwadoc

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Hah, just realized I replied to the wrong thread. Thanks for the info regardless!
 
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