In season 6 of CSI NY, episode "Lat 40 47' N/ Long 73 58' W", Sheldon Hawks was processing a compass which had an engraving in the back of it scratched off. To reveal the message he:
-hooked it up to a small electric machine, with two wires that resembled that of jump wires for a car
-Poured a clear liquid over the compass
-turned on the electric machine
-put a white powder on the compass
Then, a chemical reaction occured where the liquid fizzed up and revealed the message on the brass-like compass.
What was the clear liquid and what was the powder called?
Numbers and figures are an essential part of our world, necessary for almost everything we do every day. As important…
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