412Re: [PPLetterpress] Kreene?
- Mar 3 9:10 PMIn a message dated 3/3/2002 wayne@... writes:
<< kreene or pvc instead of glass (which I understand absorbs important UVA)
I don't believe using glass is a problem due to absorbing too much UV light.
I have been getting good plates from a home set-up using a glass-covered
vaccuum frame. Kreene may provide better contact between the negative and the
plate, however. The problem I had with the glass is that the vaccuum
apparently bends the glass slightly and thus may cause uneven contact between
the neg and the plate. Following someone's suggestion on Letpress or PP
lists, I tried placing pieces of matboard around the plate material, under
the glass (about the same thickness as the neg and plate material together).
This supports the glass during vaccuum and has solved the uneven contact.
My 4 UV flourescent bulbs are about 1 1/2 inches above the plates. Exposure
time is about 2 1/2 to 3 minutes depending on image detail and design. Sounds
like you are making a bigger system. Mostly I'm making small plates, most
less than 5x7, have done a few larger 8x10, though I often expose numerous
smaller plates at the same time, frequently an 8 1/2 x 11 negative with
multiple plates under it. I fit in the matboard all around and between the
plates. (Note also: some difference in hand-washout between small and larger
I'm glad to hear of others' exposure experience -- I was about to try kreene
but found the glass unit works fine for me now.
Let us know how it works for you! Tom
Now It's Up To You Publications
157 S. Logan, Denver CO 80209
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