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Re: bubbles in gelatin
Hi Judy,
Your on the right track. The key is to reduce surface tention to the point
where bubbles can't form.
I have used completely denatured alcohol and add what you need to reduce the
tention. There are also commercial products known as defoaming agents in the
most generic sense. You could probebly get free samples from Ceiba
?spelling? I used the stuff years ago making my carbon pigment sheets. I
also used the denatured alcohol with much success.
Good luck Judy!
Best Regards,
Michael Sandquist
-----Original Message-----
From: Judy Seigel <jseigel@panix.com>
To: alt-photo-process-l@skyway.usask.ca
<alt-photo-process-l@skyway.usask.ca>
Date: Monday, October 09, 2000 10:19 PM
Subject: bubbles in gelatin
>Hi all, especially all gummists,
>
>I've been sizing some paper for gum that's too big to handle in usual way,
>that is, by pulling paper out of tray pressing between soft plastic rod &
>tray edge to squeegee off excess gelatin.
>
>What's messier, but works sort of, is to stand large plate glass
>vertically at edge of tray (leaning against wall behind sink), stick
>gelatined paper on that & run rod lightly down the paper. The excess
>gelatin sluices back into the tray. At first the bubble problem defeated
>me completely -- for some reason far worse than by usual method. Then I
>added about 2 ounces of rubbing alcohol to remaining litre of (3%)
>gelatin. Big help to extent that I could squeegee the front
>satisfactorily, but pulling the sheet off the glass still left serious
>bubble lines on the back. And with the big wet sheet in hand, no way I
>could smooth that.
>
>Meaning the back of the paper is unusable -- tho normally (I confess) I
>print on back of a failed print on good heavy paper. I remember reading
>about some anti-bubble solution (other than alcohol) & wonder if anyone
>can say which. Kodak used to make one, but discontinued as of probably 10
>years ago....
>
>Or maybe up the ratio of alcohol (except that I reheat between batches on
>the stove, and fear inviting explosion) ? Any other advice out there?
>
>Hopefully,
>
>Judy
>
>