I was now face to face with the castle moat, which was, indeed, very wide and very deep. Alas! I could not swim, and my chance of escape seemed of a truth hopeless, as, doubtless, it would have been had I not espied a boat tied to the wall by a r... Read more of Crossing The Moat at Math Puzzle.ca

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Horticultural Ink

Copper one part, dissolve in Nitric Acid ten parts
and add Water ten parts; used to write on zinc or tin labels.

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