dyes used in color 120 film

[ryn]

Hi everyone,
New to the forum and wondering if anyone has a resource for info on color profiles of different brands of film? I've been using the dye as a pigment and would like some history. I've been told that color profiles of eastern(Fuji) and western (Kodak) film are influenced by the skin tone of the consumer base and would like to verify it.
Any ideas?
Thanks!

 

[Sirius Glass]

Welcome to APUG

 

[Photo Engineer]

The dye sets in negative films is influenced by the need to print on a color paper.

The need of reversal films is to present an accurate image on projection.

The reproduction of flesh tones is more of a function of the emulsions and sensitizing dyes.

PE

 

[ryn]

thanks PE. Any idea why there would be different colors of run off from Velvia(magenta),Portra(veridian green), and old Kodachrome(golden yellow) 120 film? I'm just rinsing unexposed film with water to extract these colors.

 

[Athiril]

The stuff you are washing out is not the actual dyes formed in the film, the dyes are not formed until the film is processed. The dye couplers shouldn't wash out of the film with water either, as the process is a wet process, and they need to stay in their respective layers, while Kodachrome doesn't have dye couplers in the actual film.

 

[Gerald C Koch]

With today's color films skin color is probably more influenced by the color temperature of the light illuminating the subject. The Kodachromes had a distinctly cold tone but this was not intended. There was an imperfect fit between the three dyers produced. One of the couplers used was not a good match. Therefore in subdued light skin tones took on a definite blue cast. Some people liked the look others did not.

 

[Photo Engineer]

What you are washing out are acutance dyes (for sharpness), AH dyes (to prevent halation) and trimmer dyes (to make sure the speed is correct).

PE