Three color separations directly onto Ilfochrome.

[MMfoto]

Would it be possible to expose a color slide onto color positive paper, Ilfochrome Classic, with three separate exposures from a single color slide using Cyan, Yellow, and Magenta filters and come out with a normal color image? My first thought is that exposures would be too long for the paper and that reciprocity failure would be a big factor. Are there any other factors I may be missing?

My intent is to manipulate the separated colors to control the final image without making actual single color separations.

Would it work?

BTW, To make proper three color separations from a slide to be printed on reversal paper I assume the only "practical" way (aside from digital) would be to make the separations onto color positive film. Is this accurate?

 

[PHOTOTONE]

In theory this is quite practical, and indeed I remember a color print process in the 1960's called FR-Color that came with a tri-color filter that you slid in a frame below the lens and you gave each primary a separate exposure. Yes exposing the separated colors individually one after the other would work just fine, it would just be more cumbersome than a single exposure. Also, in the late 1960's, early 1970's Durst made a small color package printer using roll paper, that would indeed print to color paper through successive primary color filters.

 

[Photo Engineer]

You don't use C/M/Y exposure, you use R/G/B with Wratten 99/98/70 filters (I think I got that right from memory).

Exposure times will be very very long.

PE

 

[PHOTOTONE]

You don't use C/M/Y exposure, you use R/G/B with Wratten 99/98/70 filters (I think I got that right from memory).

Exposure times will be very very long.

PE

Right, R/G/B with direct positive materials, and C/M/Y with color negative to positive printing. But the concept is the same, you can print through successive filters rather than use a color head, or multi-filter (CC filter) sandwich.

 

[Photo Engineer]

You can use R/G/B for 3 color exposures in negative and positive printing with 3 sequential exposures. With C/M/Y you use 1 single exposure and the filters are for correction of the color temperature only. C/M/Y can be used with negative or positive printing too.

PE

 

[Bill Mitchell]

Minolta (the late lamented), used to make an enlarger which did just that, with three light bulbs and three filters. I expect that they are still available on ebay, but the exposures were very long. I think that you'd find it easier to make a straight overall exposure, and then burn/dodge with specific color filters in the light path.

 

[MVNelson]

Minolta (the late lamented), used to make an enlarger which did just that, with three light bulbs and three filters. I expect that they are still available on ebay, but the exposures were very long. I think that you'd find it easier to make a straight overall exposure, and then burn/dodge with specific color filters in the light path.

I have it , minolta/beseler 45A uses 3 color RGB strobes and I have used it to do just what you proposed.