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Re: pH testing pen source



At 10:13 AM 9/8/99 -0400, you wrote:
>TALAS might have them, but so do Gaylord, and University Products. Don't
>know how conterfeit id pens would do the same thing, though I suppose it
>might with some materials. The original is acidic, the fake alkaline, but
>what happens with a deacidified original, or a fake on acidic paper... Oh
>well. They'll just tell you a paper is acidic or neutral/alkaline, but not
>at what pH. Good for a quick benchmark, but not much else.
>
>Peter

Hi Peter:

Thank you for your quick response to my inquiry.  in my web search, I came
across a wonderful comparison of different pens and exactly what color they
read on specific pH levels:

http://palimpsest.stanford.edu/byorg/abbey/ap/ap03/ap03-5/ap03-508.html

enjoy!

-Andy Darlow

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