From: Familles Michaud (famillesmichaud@hotmail.com)
Date: 07/31/02-01:45:27 AM Z
Hello,
Pigment photographs use the action of light on diChromates (Cr2O4) to make
colloids (albumina, gum...) insoluble, thus retaining the pigment in the
picture.
The problem is that diChromates are very toxic.
The periodic elements table shows that Molybdenum (Mo) and Tungsten (W) are
on the same column than Chromium (Cr). The big advantage is that these
products are not toxic compared to Cr.
Did anyone heard about the use of (di)Molybdates or (di)Tungstates instead
of diChromates on pigment photographies ?
If yes, what is the recipie ? Apparently, these Mo/W-ates are
photosensitives to UV but may not be sensitive enough to natural light to
take pictures... any information ?
Is there an easy process to take photographs without the use of toxic
products. This process should be handled by children from A to Z using a
hand made pin hole camera (even is exposure is taking hours). That is why
toxic products are definitely not allowed.
Best regards
Frédéric
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