Thanks for your input. Is there a particular order in which you mix the
ingredients?
Rajul
On 11-Dec-06, at 10:50 PM, Loris Medici wrote:
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 Aralők 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.