From: Alberto Novo (alnovo@inwind.it)
Date: 01/12/02-04:20:33 PM Z
Pleas note that usually we know something about the chronic toxicity of some
substances more than 20 years later their first use...
Alberto
> Dave:
> Diazo salts is the most recent application to replace bichromate that I
have
> heard of. I do think the light sensitivity is slower. It is currently
being
> used in the silk screen industry and it reacts in the same manner that
> bichromates do on amino acid chains. As you may know bichromated salts
make
> any organic material sensitive to light. Where the light strikes the
> emulsion, amino acid chains are formed and they are insoluble. Diazo
works
> in the same way but is safe to use and to the best of my knowledge it is
not
> toxic (so the companies say).
>
> Bob
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