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Hi message revealed by fire writing. (Anne Helmenstine)Use a special invisible ink to leave a message. Reveal the message by touching a flame to the edge of the writing, causing it to burn away in smoldering flame. The paper is left untouched, except for the fire writing... Try it

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January 30, 2014 at 1:24 pm
(1) Ladislaus says:

I would like to know exactly how BORAX used to extract gold as in our area mostly use mercury

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