Re: Taming Fabriano Artistico (Trad. White) for Cyanotype
3 Aralık 2008, Çarşamba, 5:10 pm tarihinde, Christina Z. Anderson yazmış: > Ammonium ferric citrate (why is it written this way--can it equally be > written ferric ammonium citrate or is that a chemistry no no?) has bigger > molecules than ammonium ferric oxalate and hence is harder to absorb in > the > paper so I have been told (not being able to see it with my eyes :)) but I > have not personally had a problem with bleeding although I certainly do > see > blue water from washoff. I observed this. The paper absorbs New Cyanotype sensitizer much easily compared to Trad. Cyanotype (or Argyrotype and Vandyke)... I haven't had bleeding problem either, except for one case I was using CP Canson Watercolor paper... > > What do you mean by "peptization" Loris? IIRC, it's the case when the Prussian Blue particles form / become too small (nano scale) / won't form strong lattices, so they won't get trapped inside the paper fibers, they will leach out (bleeding) instead. > And is there a conservation difference in paper that has been treated with > HCL vs. oxalic acid, I wonder? Or have I watched too many horror movies > where someone's face melts when acid is thrown on it? Well, there will be definitely some weakening unless you're careful / you use too strong concentrations. But if one manages to get it out of paper it won't continue to cause further problems methinks. We have examples of vintage Pt/Pd prints which were presumably cleared in HCl. (Once upon, that was a widespread procedure IIRC...) > ... > I find it fascinating that cyanotype is so versatile. Me too. Regards, Loris.
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