From: martinm (martinm@SoftHome.net)
Date: 07/31/02-10:45:36 AM Z
> Did anyone heard about the use of (di)Molybdates or (di)Tungstates instead
> of diChromates on pigment photographies ?
Eder writes ("THE CHEMICAL EFFECT OF THE SPECTRUM"):
"VANADIUM. - Vanadic acid behaves like chromic acid (Gibbons, "Phot. Corr.,"
1876,
p. 159).
MOLYBDENUM.-Molybdic acid is coloured blue in the light, when in the
presence of
organic matter. A solution of molybdic acid, in sulphuric acid, becomes blue
in sunlight, but
only in the presence of organic matter (Phipson, "Phot. Arch.," 1863, p.
249). Later ("Chem.
News," 1874, p. 33), Phipson again recommended this as an actinometer."
>
> Is there an easy process to take photographs without the use of toxic
> products.
There are developers based on ascorbic acid...
Martin
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