Re: [PPLetterpress] Re: platemaking issues
- Something new (something old & new) every day. Thanks, Eric.
My nuArc vacuum frame has a name plate but no model number, no bleed valve,
but a pressure gauge on the line. It has a glass top hinged within a metal
frame, with a vacuum area about 21.5 x 25.5. Not clear whether it ever had a
light attached -- it appears to have been part of a larger apparatus. The
vacuum space below the glass is sufficient to handle plate material, more than a
just contact prints.
Meanwhile, I do dust the plate material with powder to prevent it from
grabbing the negative. I don't think air bubbles are the cause of the exposure
irregularities I experienced. Uneven pressure on the plate and negative at the
edges of the plate (which I have assumed involves some slight bending of the
glass) seems the likely explanation. Mat board around the plate seems to solve
the problem completely. Whatever works!
Now It's Up To You Publications
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