From: Katharine Thayer (kthayer@pacifier.com)
Date: 04/03/02-06:08:03 AM Z
Sorry, for some reason the quote function on my mail program didn't pick
up your first paragraph, which I meant to comment on:
Joe Smigiel wrote:
>
>>>>>I suspect the actual color of the ink is of little consequence in the effect. If the particular ink/stain is a
window to UV, then as Jeffrey suggests, the sensitizer will be affected
regardless of the color of the ink. When I
tested the absorption spectra of ammonium dichromate a few years ago it
had very little absorption in the visible
wavelengths. >>>>>>>
I thought I'd read somewhere that dichromate has a secondary
sensitivity peak around 420; I take it that was not your observation?
>>>>>As a result, I would not expect any color to affect it. I did test the spectral negatives and found
the results poor compared to conventional negatives and inkjet negatives
produced using Cone piezography quadtone
inks (carbon based?).>>>>>
This is certainly consistent with what I've seen; although I haven't
tested the Cone inks, I got much better results with regular black ink
than with the colorized negatives for printing gum.
kt
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