In a message dated 1/19/06 2:01:03 PM, kthayer@pacifier.com writes:
> This is an open question. Those of us who use this combination don't
> harden it, and certainly there hasn't been anything in my gum
> printing practice that dictates the hardening of the combination;
> that is, the sizing works quite well without further hardening. But
> I've also sized with unhardened gelatin without finding any practice-
> driven need to harden it, and have relied on the hardening it
> receives in the gum printing process (somewhere I have demonstration
> visuals to show that the gelatin is hardened by the dichromate in the
> gum process) for hardening for purposes of retarding mold and such. I
> don't know if this would be the case for the gelatin that's mixed
> with the gesso, but I don't know why not either.
> Katharine
>
Mark I. Nelson
www.MarkINelsonPhoto.com
www.PrecisionDigitalNegatives.com
PDNPrint Forum @ Yahoo Groups
Received on Thu Jan 19 14:16:03 2006
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