> But this would still not answer my interest. I am not just interested
> in how fast an exposure can be made. I am interested in what result in
> the print can be produced (or controlled) by a certain spectral
> illumination. Is there any quantification of variations in contrast as
> Sandy King mentioned for some processes? What other qualities are
> influenced by a shift in spectrum?
>
> Various light sources and window material have been discussed for quite
> a while. Has anyone, or is anyone investigating what differences may
> occur in the print as the exposing spectrum is altered?
>
I found it interesting that Cartwright Mills notes in an Autotype
publication circa 1930s "Notes on the Rotary Photogravure Process" that
a 5% dichromate solution is flatter than a 3% solution mainly because
the additional dichromate acts as a yellow filter.
Walt
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