U of S | Mailing List Archive | alt-photo-process-l | Re: gum mixes

Re: gum mixes

  • To: alt-photo-process-l@usask.ca
  • Subject: Re: gum mixes
  • From: Guido Ceuppens <altguido@gmail.com>
  • Date: Thu, 03 Jan 2008 16:08:21 +0100
  • Comments: "alt-photo-process mailing list"
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  • Reply-to: alt-photo-process-l@usask.ca

2008/1/3, Christina Z. Anderson <zphoto@montana.net>:
Dear all,
Guido, same thing--do you use
that little potassium dichromate in your mix--essentially 1-5 parts gum to
only 1/2 part pot di? If I have anyone's info wrong, let me know.


Sorry probably expressed myself wrongly:

I make a stock mixture of 1 part (gr) watercolor paint to 6 parts (ml) gum. This stock solution is, before use, diluted with up to 4 parts of gum or used as is. Sensitiser (saturated pot bichromate) is added at a ratio of half the total volume of the paint/gum mixture.

I use a sun bed, tubes 20 Cm's from the paper, and exposure is between 1,5 to 4 minutes.


  • References:
    • Re: gum mixes
      • From: "Christina Z. Anderson" <zphoto@montana.net>