RE: I'm back! Hi to all + Silane?
Thank you Marek. Yes, this is exactly the compound I was planning to purchase (from Sigma-Aldrich or Fluka)... Carbon prints on glass (by back exposure) sounds interesting. I remember that you also did gum prints on glass with the same method. I'm definitely interested -> I would like to read your notes very much! (About both carbon and gum on glass by back exposure...) Regards, Loris. 23 Haziran 2008, Pazartesi, 10:59 pm tarihinde, Marek Matusz yazmış: > > Loris, > Sorry it took me a while to reply and welcome back. I was out of town for > several days and could not get to my notes. I have tried the silane > approach last summer and it works great for gelatin and gum. They do > adhere very well to the treated glass. The particular silane in question > is aminopropyltriethoxysilane, widely used in industy to bond fiberglass > to resins. Here is a website on the product. > http://www.dowcorning.com/applications/search/products/details.aspx?prod=02649659&type=PROD > There is a usefull PDF file that you can download on that page (called > Chemical manufacturing) that gives useful tips on treating glass. > > If you are interested in prints on glass I would suggest a different > approach. Carbon prints on glass. No messy transfers. The trick is back > exposure. That hardens the gelatin at the glass surface and the unexposed > image on the top can just be washed away. I never had any problems with > adhesion of the image on just clean glass, no special treatments. I guess > hardened gelatin just sticks to the glass. The advantages of this process > are that you can use any pigments of your liking. Transparent organic > pigments work well just as well as traditional pigments like carbon. > The only drawback is that for very sharp images you will need a collimated > light source, since the emulsion and negative are separated by the > thickness of the glass. Sun works very well. You should have plenty of > that in Istanbul. > I would be happy to supply more info on emulsion that I used, > sensitization, etc if you are interested. > Marek
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