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

[MattKing]

This came to my attention, and it seems excellent!

 

[koraks]

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.

 

[Andrew O'Neill]

Enjoyed that. Thanks!

 

[halfaman]

Great color negative film explanation but on the other hand reversal process is missing fogging stage after FD and therefore explanation makes no sense.

 

[warden]

It's just amazing.

 

[cmacd123]

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.

 

[fdonadio]

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

I though the big yellow was your friend…

 

[cmacd123]

I though the big yellow was your friend…

was it not big yellow that came up with the Orange mask?

 

[fdonadio]

was it not big yellow that came up with the Orange mask?

I knew I was missing something…

 

[DREW WILEY]

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.

 

[pwadoc]

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]

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.

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]

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.

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