From: Judy Seigel (jseigel@panix.com)
Date: 04/13/02-12:20:17 AM Z
On Mon, 8 Apr 2002, Sandy King wrote:
> First, let us assume that Witho does have a problem with bubbles,
> which is quite likely since the method of sizing he describes does
> lead to the formation of many tiny bubbles. Bubbles tend to form as
> the solution cools and when the paper dries they leave specks. The
> solution to this is to mist the paper lightly with alcohol just after
> brushing, and before the gelatin solution begins to set. This will
> eliminate virtually all bubbles. You might also try a slightly more
> dilute gelatin solution, say 2-3% and this will delay set time
> somewhat and give you plenty of time to mist.
Sandy, would you please explain why you mist with alcohol, not just with
water ? I've noticed these specks from time to time, but am pretty sure
they disappear as the size ages, definitely as you coat with a gum layer
and expose .... or maybe you just don't notice them any more. I don't see
them as a real problem, but you pique my curiosity -- is there some reason
the alcohol kills them & a plain water mist wouldn't?
I remember by the way some years ago Terry King saying that you had to
totally dissolve the gelatin in hot water with a longish soak -- to avoid
those shiny specks. I tried that & found it didn't make the slightest bit
of difference.
> If the problem is due to the crystalline faces of the gelatin
> microcrystals a solution might be to add some starch to the gelatin
> solution to give a more matte surface.
That sounds like an interesting variation... Have you done it? How much
"starch" would you add? Without pre-cooking? Cornstarch?
Judy
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