Re: gum/dichromate ratios

Hi Chris

Your dichomate is that ammonium or potassium?

regards

Roman

----- Original Message -----
From: "Christina Z. Anderson" <zphoto@montana.net>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Thursday, November 10, 2005 3:19 PM
Subject: Re: gum/dichromate ratios

>
> 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
> diginegs.
> Chris
>>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 11:21:33 2005