RE: glyoxal yellowing now: How do you know it's hard?

Ryuji,

> > Also to what degree do gelatin sized papers need to be hardened?
>
> Enough to sustain the coating of the sensitizer, processing and all
> other wet handling.

Well DUH! :)

Let me rephrase my question.

Is there a quantitative method the average gum printer can avail themselves
of to measure the minimum degree of hardening required for multi-coat gum
printing other than practical or empirical experience?

Don Bryant
Received on Fri Feb 4 17:53:39 2005