Re: Gum "tanning" process

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From: Katharine Thayer (kthayer@pacifier.com)
Date: 05/13/01-07:22:22 AM Z


Judy Seigel wrote:
>
>
> I have that book and have read the relevant pages, don't remember anything
> that would apply to this discussion (which I admit I don't fully
> understand), but I'll check again, with that in mind.

Thanks, and I take your point that it might not be completely helpful,
if it's based on theory and conventional wisdom rather than practical
observation and analysis.

The rest of your comments are exactly in line with my own observations.

Katharine

 I'll add that my
> experience with such books (and I recently came across an example in
> Clerc) is that statements are often made, not from observation, but from
> theory, that are not borne out in practice. The theory is perhaps correct
> as far as it goes, but where it goes is not necessarily to this particular
> place.
>
> I also repeat what I've already repeated -- I almost never see the stain
> spoken of here in orange, and in gray-green only when I "cleared" stain
> from an attempt at a gum arabic/am di size in Pete's sulfuric acid bath --
> which suggests to me that it is NOT intrinsic to light/chromium/colloid
> per se, but to certain uses of it/them.
>
> Judy


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