Re: UV lights for gum

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rickm@gethen.com
Date: 04/25/00-05:12:41 PM Z


Using gelatin POP, I find that aiming the frame away from the sun at a clear blue northern sky in April through October to give me the best results.  I'm just south of Chicago.  The prints have a longer scale but also appear "snappier" (I know, a contradiction).

Another reason not to point the frame directly at the summer sun on a clear day is that one can really cook a negative that way.  I use dense negatives (>=2.30 density range) to give longer exposures that take advantage of the long range of values that the self-masking POP can produce.  These negatives are essentially black, and black absorbs heat.  Put this under glass in a print frame (a very small greenhouse) to trap all that heat, and you can melt gelatin on a hot summer day.  I've never had it actually turn liquid, but I have had it soften one negative enough that the weave pattern of Kodak cotton gloves was pressed permanently into the soft gelatin with just a very light touch.



Sandy King <sanking@hubcap.clemson.edu>

04/25/2000 12:01 PM
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        Subject:        Re: UV lights for gum


A question for those who use the sun as UV light. Do you expose with
the contact frame in full sunlight or in the shadow? Does it make a
difference in terms of apparent sharpness?

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