Katharine Thayer wrote:
>
>
> Although some people may never see a yellow stain in practice, others
> may see it often, and it would be misleading to give people the
> impression that there's only one kind of dichromate stain and that one
> can treat them the same.
I suppose that statement could be confusing, because in fact one does
treat them the same in terms of removal; the same clearing agent removes
both reduced chromium and unreduced chromium. What I meant here was you
can't treat them the same in terms of how stable they will be to
exposure to direct or indirect UV.
kt
Received on Fri Aug 12 08:24:00 2005
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