printing gum on glass
Quiet list this summer! Is no one doing photography??? Tomorrow on my 4th of 6 trips this summer (gasp); onto APIS. No rest for the weary. Hope to see some of you there. In between trips I work on myth busting. Anyone print gum on glass? I was working on an example to disprove the myth that printing on glass produces no midtones, a myth that seems to be repeated in books and is based on the assumption that the surface is sooo smooth with no bumps that it will not hold the midtones. Well the total image printed as I suspected. But I noticed an odd thing--the top layer of gum when it hit the water sloughed off in pieces, revealing the complete image below it. I wanted to see if anyone else had noticed this or even printed an image on glass (probably not), and if, those of you carbon printers (Sandy?) have said unequivocally that your tissue hardens from top down, correct? This example is not refuting that theory--because the top slough off layer was hardened. But I still am working on the solarplate statement, perhaps ultimately not at all related, that solarplate hardens from the bottom up and why that might be different than gum. I do not know what the photosensitive substance is in solarplate but the polymer being hardened is either nylon or pva and perhaps other things, and pva is also used in dichromate processes. Chris _____________________________________ Christina Z. Anderson Assistant Professor, Photo Option Coordinator Montana State University, VCB 220 Box 173350 Bozeman Montana 59718 406.994.6219 CZAphotography.com _____________________________________
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