I stumbled on this 18-month-old thread. I didn't want to revive an old thread only to take a tangent, so I'm asking here.
The Flic Film C-41 kit uses p-Phenylenediamine (PPD) instead of CD4. How can that possibly work? Yes, I know that PPD is a precursor of CD4, but the molecules aren't that similar. I am surprised that a color coupler intended for CD4 would produce anything close to the correct dye if it's given PPD instead. Honestly, CD3 and CD4 look a lot closer to each other than either does to PPD.
I am sure the kit wouldn't pass a rigorous test, but that's not what I'm thinking of. I don't understand how the dyes can even be in the ball park. If you change the dye with a completely different molecule, I could easily have imagined that blue could turn violet and green could turn yellow, and the overall image could just look like an alien planet. But clearly that's not what happens.
Interestingly, Flic Film's ECN-2 kit uses CD3 and not PPD.
The Flic Film C-41 kit uses p-Phenylenediamine (PPD) instead of CD4. How can that possibly work? Yes, I know that PPD is a precursor of CD4, but the molecules aren't that similar. I am surprised that a color coupler intended for CD4 would produce anything close to the correct dye if it's given PPD instead. Honestly, CD3 and CD4 look a lot closer to each other than either does to PPD.
I am sure the kit wouldn't pass a rigorous test, but that's not what I'm thinking of. I don't understand how the dyes can even be in the ball park. If you change the dye with a completely different molecule, I could easily have imagined that blue could turn violet and green could turn yellow, and the overall image could just look like an alien planet. But clearly that's not what happens.
Interestingly, Flic Film's ECN-2 kit uses CD3 and not PPD.