Re: Could someone summarize that gum up or down discussion?

From: "Christina Z. Anderson" <zphoto@montana.net>
Subject: Re: Could someone summarize that gum up or down discussion?
Date: Fri, 14 Apr 2006 07:50:25 -0600

> Since it was initially a test to prove the notion of top down hardening, if,
> in fact, the dichromate in a brushed on coat "sunk" to the bottom of the
> brushed on coat and therefore lurked near the surface of the paper, wouldn't
> exposing from the back therefore still support both theories--either top
> down hardening or hardening where the dichromate lurks? Just wondering...

I think the plastic base exposed from back is in favor of top down
model, at least for nonabsorbent substrates.

One question raised is nonuniform distribution of dichromate when the
sensitizing solution is coated on absorbent substrate.
Received on Sat Apr 15 20:01:34 2006