Re: Remove color while leaving the emulsion (?)

From: Robert Schaller (email suppressed)
Date: Thu Jun 11 2009 - 18:35:50 PDT

That's a very good question, Myron. How, indeed? The various photographic
bleaches -- dichromate/sulfuric acid, ferricyanide/halide, etc., work on
silver metal, and fixer on silver halide, but once the silver has been
removed from color film, all that's left of the image is dye. Seems like it
would call for a "bleach" of a different sort, more like the whitening kind
that people use on laundry or teeth, but not quite the same as sodium
hypochlorite (household bleach), as (it has been observed here) that has a
tendency to take off the emulsion, too. Gelatin emulsion is not as strong
as either teeth or fabric!

Maybe hydrogen peroxide? Maybe different things would work on different
film stocks? Or are the dyes similar enough?

On 6/11/09 2:22 PM, "Myron Ort" <email suppressed> wrote:

> We talked of the chemistry doing this for b&w film, but what will
> remove opacity from a color print without removing the emulsion?
> Any info on this one?
> Myron Ort
> __________________________________________________________________
> For info on FrameWorks, contact Pip Chodorov at <email suppressed>.

For info on FrameWorks, contact Pip Chodorov at <email suppressed>.