From: Myron Ort (email suppressed)
Date: Fri Jun 05 2009 - 16:24:30 PDT
Will water soluble dyes work on the emulsion of estar or mylar based
film stocks as well as on the old acetate bases?
On Jun 5, 2009, at 3:29 PM, JEFFREY PAULL wrote:
> It is possible to remove the B&W emulsion - the picture material -
> and leave the clear gelatin intact.
> The gelatin will absorb water soluble transparent dyes (Dr.
> Martin's, for example).
> B&W image silver can be removed by soaking it in a solution of
> Potassium ferricyanide whcih you would find at a photo store still
> selling darkroom stuff,
> or from a supplier. Try a teaspoon of the (pretty) orange powder to
> a gallon of water. When image is very light or has disappeared,
> dunk/rinse in water,
> and submerge in photo fixer for about 5 minutes. (photo store that
> sells darkroom stuff)
> Potassium ferricyanide has that cyanide component tightly attached
> to the potassium, so it's safe to use.
> However: rubber gloves, and don't let it sit around in bright
> light. Bright light only, will eventually disassociate the
> potqassium from the ferricyanide.
> Otherwise it is stable. There are no fumes either.
> To remove the emulsion (colour or B&W) and the gelatin as well,
> without using chlorine bleach,
> 3 things in any combination help this process along:
> - heat, so hot soak speeds things up,
> - time, so the soak may need overnight.
> - alkalinity also speeds things up
> Sodium Metaborate which Kodak sells under
> the name of "Kodalk balanced alkali",
> Potassium Carbonate,
> Sodium Phosphate aka Trisodium Phosphate,
> You can get this as a heavy dutry cleaner in a hardware store.
> Follow package directions and
> Jefffrey Paull
> For info on FrameWorks, contact Pip Chodorov at <email suppressed>.
For info on FrameWorks, contact Pip Chodorov at <email suppressed>.