From: TERRY KING, 101522,2625
TO: Peter charles fredrick, INTERNET:pete@fotem.demon.co.uk
DATE: 03/06/96 10:58
RE: Copy of: Re: Copy of: Re: Copy of: buying Gum Arabic
I wrote
The sensitised gum is dried in the dark and then
> exposed for two or three minutes, and then washed to remove the traces of
> Dichromate, before the first coat of pigment is applied. I did think of a name
> for this method.
> The method works well for hot pressed papers.<
Peter replied
>
> Yes I can confirm that this method does work well, however there can be a
> few problems associated with its use. The exposure required to set the
> layer is very brief and critical, I have test run this method at Kingsway
> college KTC, we use a sunbed as an exposure unit, which gives us an
> exposure of 3 to 10 mins when printing an average gloy gum print, using a
> standard mix of 1 part , distilled water, 1part,saturated solution amm
> Dichromate ,and one part gloy gum. With one part pigment to 10 parts
> standard mix.
You just use the gum or gloy mixed with 50/50 with the saturated dichromate. I
am surprised you put water with it Peter. Shove it under until you perceive a
change in colour and whip it out, about a minute. We can manage 0.1 of a second
exposures under the enlarger, what is so difficult about 1 minute under my lamp
or 15 secs ( ? ) under yours ?
Terry