Re: gum/dichromate ratios

From: Christina Z. Anderson ^lt;>
Date: 11/10/05-08:19:02 AM Z
Message-id: <005701c5e601$f9d9bf40$4b6992d8@christinsh8zpi>

I use I part gum powder to either 1 or 2 parts water, weight to volume, and
then use my gum/pigmnet to dichromate as 1:1, but the dichromate part of the
equation is either 1/2 water 1/2 saturated dichromate or 3/4 water 1/4
saturated dichromate. In other words, I only use a 15% or 7.5% dichromate
solution in my mix.

Lately i switched to the 15% as I'm testing my new curves and colorized negs
and such, just because the layer is very stable and if I want to let it
automatically develop (e.g. sit face down in water) the color falls off just
fine, or if I want to spray develop it holds up to spray perfectly.
But I don't use saturated dichromate 1:1 any more since switching to
>I use 1 part of saturated dichromate to 2 or 3 parts of gum/pigment
>mixture. My gum is commercial 14 baume. Less toxic and expensive chemicals
>(ammonium dichromate) the better. As you can see the ratios are flexible
>and you will do best finding your own workflow.
> Marek M
> Houston
Received on Thu Nov 10 08:21:15 2005

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