RE: Gum over Cyanotypes
Hi Marek, my problem is the opposite. I expose Cyanotype bone dry, I expose the gums very humid. Will try to solve this first... Thanks & regards, Loris. 29 Nisan 2009, Çarşamba, 10:08 pm tarihinde, Marek Matusz yazmış: > > Loris, > > I do not print extra large prints, 13x17 is the largest. But as far as > registration is concened I would consider my papers to be dimensionally > stable after the initial soak. Registration on a light table also helps to > register what is impoortant in the print. > > What I know for a fact and others have noted as well is that humidity at > the time of printing makes a big difference. I have leaned never, ever to > print my initial cyano layer on a rainy and cold day. I could never > register these properly. Actually after I figured humidity is so > imposrtant I could turn the heat up in the house and then some air > contiioning to reduce humidity, or just wait for the sun to come out. > > I have not used a hair dryer in years. Always just hang them to dry. I > work in batches of several prints and by the time I an done coating my > first print is ready for exposure. > > The order of soak and size makes a difference IMO. My reasoning for sizing > first and soaking later is as follows: gelatin shrinks more then paper > when it dries, hence heavily coated papers will curl (like old B&W > papers). > > If one coats the paper first and then soaks it to shrink later, the > gelatin will shrink when drying and paper will shrink in soak, so they > will both shrink "in synch". No specific measurements here, but I feel it > reduces the curl. > > Marek > > > > >> Date: Wed, 29 Apr 2009 11:33:09 +0300 >> From: mail@loris.medici.name >> Subject: RE: Gum over Cyanotypes >> To: alt-photo-process-l@usask.ca >> >> Thanks Marek will try this. >> >> It's amazing that you can print 10 layers w/o registration problems >> using >> the same negative. In my practice gum further shrinks paper when drying, >> moreso where it's thicker than average (= dark shades of the print). I >> can >> see the relief on the back of the paper starting with the 3rd layer... >> And >> it's pretty stiff to the point of being able to curl 300gsm paper in >> case >> of low key images. Now I'm confused. Will try thoroughly shrink the >> paper >> as you/Don and others describe and see what happens... >> >> Regards, >> Loris.
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