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Re: applying images to ceramicsWARNING
At 2001/04/06 08:56 PM -0600, Herb Maxey wrote:
> >>I have felt nervous about encouraging
> >>a firing of dichromate but I suppose it is no worse that many other common
> >>glaze ingredients`
>
>Proceed at your peril. It is a dangerous material - ESPECIALLY when it is
>heated. This chemical is not to be taken lightly. Ammonium Dichromate is a
>known Carcinogen, it is toxic by inhalation and/or ingestion and serious
>lung damage can result from breathing the dust. It can cause liver and
>kidney damage as well as cause external ulcers.
Before you go on with your talk of doom and destruction, tell me: how
much dichromate is left in the image after exposure and washing, before
firing? I haven't made any studies, but I would surmise there isn't enough
to register with ordinary qualitative analysis studies. I'll repeat: there
should be no dichromate remaining after exposure and washing, no measurable
amount that could do any harm. The dichromate is merely a catalyst to
reform the structure of the colloid so that it becomes insoluble when
exposed - it does not become a part of the colloid (gum or gelatin) molecules.
Sil Horwitz, FPSA
Technical Editor, PSA Journal
teched@psa-photo.org
silh@earthlink.net
Visit http://www.psa-photo.org/
Personal page: http://home.earthlink.net/~silh/