Re: Clearing Gum Bichromates

Hans Nohlberg (chiahans@tripnet.se)
Fri, 12 Jan 1996 01:44:45 +0200

On Thu, 11 Jan 1996, Luis Nadeau wrote

>Another way to avoid the stain problem is the double transfer technique.
>You transfer to a temporary support, e.g., white opaque plexiglass so you
>can monitor what is going on and develop and dry on it. The plexi does not
>pick up the stain like paper fibers do. Then you transfer to a final
>transfer paper suitable for this technique (it needs a thick, *soft*
>gelatin layer)
We use the double transfer technique in our 3-color carbon process. When we
remove the soluble support it is very yellowish from the dichromate,
especially where the dark parts of the image were. Therefore we always
clear them with pot metabisulfite. Do you really think that this clearing
is unnecessary and that all dichromate stayed in the STS?
Best regards, Hans & Chia