Re: Gum hardening -- top down?

Chris makes some of the best gum prints I have seen so I guess she
has found a way to overcome her very poor working habits.

Sandy

>In a message dated 6/4/06 2:35:33 pm, zphoto@montana.net writes:
>
>
>>Hey, but Terry,
>>Looking at your website does not answer the question that I asked:
>>
>>I asked:
>>"Are you suggesting that too much gum creates a situation wherein the
>>dichromate will plummet to the surface of the paper and fall out of
>>solution, or separate somehow from the pigment in suspension? Tell me why
>>you may suggest this as a reason? What am I missing here?
>>
>>If it is that you are thinking my solution doesn't have enough fluid in it
>>to keep the ammonium dichromate suspended, because there is too much gum
>>solid, mind you I am only using 15% am di which then in my mix becomes a 7%
>>solution, far below the 30% saturation point."
>>
>>Please, do tell...
>>Chris
>>
>>
>
>
>Chris
>
>When I started gum printing as there was no one to teach me how to
>make gum prints, let alone the large multi-colour prints I had in
>mind, I had to learn from a lot of my own mistakes. A scientific
>empirical approach.
>
>I started with pure pigment and W & N gum arabic which was about 17
>Baume. I found that if I tried to use anything thinner there was a
>much increased chance of staining of the highlights. I also
>preferred mixing my own colours and gum to the tone and hue I
>required with a palette knife on a plate and then mixing in the
>dichromate. Then I was using 11% potassium dichromate and my own gum
>made from gum arabic powder to consistency of. again. 17 Baume.
>Doing this has meant that I have never had dichromate settling out
>of the mixture.
>
>I realise that I did not intend to say 'too much gum', what I should
>have said was too much dichromate and/or 'gum that is too thin'.
>Alternatively, you are leaving the mixtures to stand longer than I
>would. There are lots of variables.
>
>Terry
>
>
>Terry King FRPS
>
>RPS Historical Group (Chairman)
>
><>www.hands-on-pictures.com/
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>1. An excellent thing is as rare as it is difficult.(Spinoza)
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Received on Thu Apr 6 11:48:07 2006