RE: Arches Aquarelle and Gum
Thanks Catherine. Adding oxalic acid to the sensitizer may help in printing on buffered papers, but with the added expense of making the surface gritty and causing abrasion due to formation of calcium oxalate (kidney stone) cystrals on surface - you practically rub the sharp crystals over the paper white sensitizing and scratch it... Also, tonal gradations suffer due to relatively grainy results. Probably the paper you're using is unbuffered -> since you are happy with the results. BTW, (this is especially for Anne) I tried Weston paper samples (given to me by Sam - thanks again!) with classic cyanotype and it works like a charm. Anne, forget about Masa paper -> buy Weston paper! A warning: since the paper base is quite warm, the result is a more greenish blue... Regards, Loris. -----Original Message----- From: Catherine Rogers [mailto:crogers@optusnet.com.au] Sent: Tuesday, February 20, 2007 12:19 AM To: alt-photo-process-l@usask.ca Subject: Re: Arches Aquarelle and Gum Loris, The packet doesn't say (as far as I can remember). It is the only Fabriano artistico I have found here in Oz. I realized you were very carefully making a distinction - just as I hit the send button. I use a formula with oxalic acid in the coating solution. I havent used anything else because it works so well. Apart from that, everything else is standard - except not totally drying the coated paper before use. I'll send you the formula and any other info when I get home tomorrow and can consult my notes. cheers Catherine From: "Loris Medici" > Hi Catherine, > > AFAIK, there are two variants of that paper: 1) Traditional White 2) > Extra White. Which one you're using? Which cyanotype formula are you > using? Do you acidify the paper before printing and/or add > citric/oxalic acid into the coating solution? > > Thanks in advance, > Loris.
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