Katharine Thayer wrote:
>
> Chris,
> Well, I guess I'm confused, because I thought that in the issue of sun
> bleaching dichromate stain, you were talking about a brown (reduced)
> dichromate stain, not a yellow (unreduced) dichromate stain.
Because if whatever it is that causes that rare bright yellow stain
(I've only seen it once or twice, when I was testing a lot of different
paper-sizing combinations) somehow arrests hexavalent chromium in the
hexavalent state and renders it stable (or at least unreducable) in that
state, that would be a rather remarkable finding.
kt
Received on Wed Aug 10 12:42:26 2005
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