I tested this because I was teaching a class, and knew that some (most)
students wouldn't go home and immediately build a UV tube box. I only
found a small difference in contrast. About One "Platinum Grade". Not
enough to be useful. If you experiment with colored glass, let us know.
I will be leaving very soon for a few weeks in Costa Rica. When I drop out
of this or any other thread I've been in, it isn't because I'm ignoring
you. It's because I'm on vacation :-)
tomf2468@pipeline.com
Jonathon Russell <Hylandscot@voyager.net> wrote:
>Tom,
>Your response, taken to its logical conclusion, seems to indicate that
>we could change the contrast of some alt.proc. by changing the color of
>the light source. I seem to remember reading long ago an old manual on
>platinum printing that said to use blue glass in the contact frame to
>increase contrast or to change the angle of the frame relative to the
>sun for the same purpose. Any thoughts from the list?
>I agree with you that since we are contact printing, the point light
>source theory isn't valid.
>
>Regards to all,
>
>Jonathon Russell
>--
>"Expose for the Secrets,
> Develop for the Surprises!"
Tom Ferguson (tomf2468@pipeline.com)
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