From: Peter Fredrik (pete@fotem.demon.co.uk)
Date: 03/27/01-06:29:20 AM Z
Hi Judy
Judy Seigel wrote:
> On Sun, 25 Mar 2001, George Huczek wrote:
>
> MYTH #3 OF GUM PRINTING -- THAT SOMETHING *BAD* WILL HAPPEN TO YOUR GUM
> PRINTS IF YOU DO NOT CLEAR. Fact: THE CHROME LEFT (IF ANY) IS ALREADY
> FULLY OXIDIZED..... IF WHATEVER TINGE OF ORANGE REMAINS DOESN'T BOTHER
> YOU AESTHETICALLY (and I rather like it), IT WON'T BOTHER ANYTHING ELSE.*
What's all the shouting about ?
George wanted to know how to clear the brown oxidation stain from a gum
print, and told him !
>
I know you won't believe me, so put your print in whatever damn thing you
like, tho it's *possible* sulphuric isn't terrifically good for paper. ?
Your assumption is incorrect .I have over the years sort out chemists and put
this question to them they have said that given the dilution of the sulphuric
acid, it should not pose any problems, as long as simple soak of a few
minutes in clean running water follows the treatment
Have you other scientific insight ?
>
> a long soak in water will also clear any residual bichromate... greener,
> cheaper, safer, too... But folks WANT to do something, a FINAL touch, sort
> of sprinkling with holy water just in case. I've heard it said that
> regular fix will "clear", postassium bisulfate (and/or ite) is
> traditional, and M. Ware & co say sodium sulfite. In any event, it makes
> sense to give a reasonable rinse after you add this non-essential chemical
> -- my guess however would be that the idea of loooong clearing bath at
> this point is a holdover from washing fixer out of SG.
>
> I think this a load of nonsnse. If you are doing multi- colour print
> controling that green stain gives real problems. Also given a bit of care
> and common sense this things do not pose any problem to saftey .As we have
> seen vis a vi the chrome /.dichromate debate in which you took a similar
> stance ie commen sense rules !
Pete
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