RE: formula for gold toner
Rayul, I think you definitely have some problems with your materials. Is it Gold? Thiourea? Tartaric Acid? even Distilled / De-Ionized Water? I used the Gold-Thiourea toner extensively and never experienced any precipitation. This toner is quite stable and will work even months later. (Will plate the container if you introduce impurities - so it's best used one shot if you need consistency.) Regards, Loris. -----Original Message----- From: Venkatram Iyer [mailto:eyeear@telus.net] Sent: 11 Aralık 2006 Pazartesi 19:17 To: alt-photo-process-l@usask.ca Subject: formula for gold toner Hi Sandy, Your article on the Unblinking Eye website gives the better Au toner recipe to contain 50 ml 1% AuCl4, 1% thiourea and 0.5g tartaric acid. When I made this up, a slurry (colloidal gold?) separated out. However, it did work as a toner. When I checked other formulae for the toner, I found that both Chris Anderson in her book Alternative Processes Condensed (p.81) and Carmen Lizardo (p.19 of PFF#8) prescribe: 10 or 5 g. citric acid / liter respectively + 25 ml 1% AuCl4. You state that this formula is unstable (your Unblinking Eye article). Dick Arentz in his 2000 book on Pt and Pd printing (p. 81) suggests that AuCl4 can be brushed onto the wetted print usually with glycerine to control application. I would appreciate your input/clarification on the above differences. Many thanks. Rajul
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