>Luis, I don't know what that "certainly not" refers to. What I meant was
>that after heating an emulsion I would assume some changes had been
>permanently installed, meaning it would not return to the condition prior
>to heating
True, whether it is heated or not.
>(You had commented that after a while *paper* which had been heated would
>return to "normal" RH. Perhaps, but as far as I know, assume & have
>observed, once you diddle an *emulsion* with heat, you can't go home again
>-- wherever you do go, you're unlikely to be back on go.)
A truism
..
>> Over the years I have run
>> into research papers, patents, etc., that cover various improvements to
>> make blueprint papers more stable before processing.
>
>I've always wondered how they prepared commercial blue print paper to have
>a shelf life of months (or more), as well as the Solargraphics kit,
>which, although it gets pale, still makes an image after quite some
>time. Do you know which stabilizers are used?
Not offhand. It is probably buried in my library somewhere. I didn't bother
to note it because: (a) The info was certainly not complete as
manufacturers would keep their trade secrets. (b) This kind of treatment is
usually not worth the hassle unless one plans commercial production and (c)
I am a non-practicing member of the Church of Cyantology;-)
Luis Nadeau
nadeaul@nbnet.nb.ca
Fredericton, New Brunswick, Canada
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