Capstaff's two-colour Kodachrome process.

[DREW WILEY]

Hollywood also had its early flirtation with two-color photography, and there's probably more in print
per that kind of application than still photo.

[Photo Engineer]

I saw many grade "B" Hollywood productions using the 2 color method. They were awful movies and awful color.

PE

[holmburgers]

Thanks guys,

Ron, I can't wait to pick Mark's brain on this topic; had no idea there were 2 dye sets!

Well, I guess you could say something fishy was going on...

[johnielvis]

THIS is what I'd like to at least get working myself--I'm particularly interested in two color that can be merged (mirror images)--I'd LIKE to register 2 pieces of regular film (reversal processed) in glass to make a 2 color transparency.

now what would be the quickest way to do this, you experienced people? Say I shoot 2 sheets with 2 different filters (one with reversing prism or mirror) for starters. Now does anybody know of something right off the bat that can be used to dye/color the 2 color records--I've seen the edwal toners--I'm thinking these color the darker portions of the transparencies rather than the highlights--but is that what we want then? If so, I'm thinking I'll buy me some green and red toner and have at it. If I need the clear portions dyed, then would not 2 roscoe filters work sandwiched outside the transparencies?--I get the feeling that you need separate white light sources for each though, right? So that can't possibly work--but that "kodachrome" seemed to work, so I'm thinking there was some kind of a registered screen in there then so you can use the same white light source (light table).

[Photo Engineer]

Solantine Pink and Chicago Blue are two dyes that come close to being a usable pair. You need the right filters to match the dye set to expose the film. These would be at about 450 - 500 nm and 600 - 650 nm for starters.

PE

[johnielvis]

whups---I just read up on the edwal "toners"...they tone the highlights...so that's not gonna work. need to use toners that tone the silver portions---I remember uranium toner is red---I figure get a standard toner "process" and then match the exposure filters (use cc filters if necessary even) is the easiest since there's an easy variety of filters for exposure

[holmburgers]

Hey Elvis,

Yep, like you discovered, those toners won't do the trick. You need to actually replace the silver with dye somehow, so that the dye is in proportion to the silver. Highlights should be clear (just as they would be with silver) and shadows full of dye.

You're also right about needing 2 separate light sources if you're going to use filters to create the color; this is heading into additive country. You could do this too, and just use silver negatives with appropriate filters to view each through. The trick here is that you'll need to combine them for viewing somehow. This is analogous to the Kromskop.

You could try dye mordanting with basic dyes (something like this, pg. 755), or making a gelatin relief image and using acid dyes, like dye-imbibition.

Basic dyes have no affinity for gelatin, hence they need a mordant which can be made via the silver, whereas acid dyes generally are attracted to gelatin and so all you need is a gelatin relief image (think carbon method, or you could try a dichromate bleach). Realistically I think those are the two best paths.

[kb3lms]

You need to actually replace the silver with dye somehow, so that the dye is in proportion to the silver. Highlights should be clear (just as they would be with silver) and shadows full of dye.

To do this, aren't you talking about something like kodachrome (as in modern) couplers?

[holmburgers]

No, there are easier ways to do it.

[Steve Smith]

Hollywood also had its early flirtation with two-color photography

I found this a while ago: http://www.youtube.com/watch?v=NObu5...endscreen&NR=1

I think it is a two colour movie film process. Gasparcolor.


Steve.