Re: GUM TESTING

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From: Katharine Thayer (kthayer@pacifier.com)
Date: 07/17/03-01:34:30 PM Z


martinm wrote:
>
 I am lurking at alt.photo to get hints about my field of
> interest
> (Lippmann photography, holography).

Hi Martin, Welcome.....

>
> I see. So the "colloid" is the paper.

I wouldn't exactly put it that way, but I think some of your points
below are worth considering. The question we've been testing isn't
inherently interesting to me, but maybe someone else would be interested
in exploring this line of questioning.

kt

Would be good to know the previous
> history of that
> particular type of paper: what kind of oxidizers, what optical brighteners
> are involved,
> are there free radicals generated? I guess a strong bleach will reduce Cr3.
> E.g. if the
> paper had been bleached by hypochlorite, UV exposure would form chlorine.
> Moreover, under certain circumstances an optical brigthener like
> titandioxide may even form
> silver halide-like emulsions. That stuff is used for solar cells etc.
>
> Martin


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