Re: gum exposures with NuArc 26-1K?
On Sat, 26 May 2007, Erie Patsellis wrote:
Just as a sanity check, is anybody on the list exposing gum with a NuArc platemaker? what are your exposures running?Do you think yours are too short or too long? Mine were always very close to exposures with the BL fluorescents as for a long time I used them interchangeably -- from 1 to 3 minutes. If yours seem long, is your glass clean? Have you cross-checked in sun... maybe your am di is too weak, or contaminated? Or negatives too dense? Gum needs density range of about 1 (IIRC, it's been a while since I measured.) Or are you mixing emulsion too far in advance? Or letting coated paper wait too long?
I also note that when I changed from film neg to paper neg (inkjet) exposure times were about half... or less. Paper doesn't have the built-in filters.
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