Re: Gum hardening: top down experiment et al

In a message dated 13/4/06 10:35:00 pm, rs@silvergrain.org writes:

>
> Incidentally, I think one question related to the top-down hardening is
> the UV-density of well-mixed dichromated gum with various pigment, per
> unit thickness. Based on it, we can calculate the penetration depth
> (it'll be an exponential function and we'll be using depth constant, or
> half-absorption depth, or some sort of index) and relate this parameter
> to the optimal coating thickness, for front exposure system.
>
Not really.

Sometimes one needs the gum to harden nearly all the way though all over the
print and sometimes not. Rather depending on the negative and the final effect
required.

Terry
Received on Thu Apr 13 16:53:35 2006