1. Scrape coating off both ends of wires with knife until metal is shiny.

2. Mix thoroughly (do not grind) approximately equal volumes ot powdered charcoal and one of the following: potassium permangenate, calcium hypochlorite, or manganese dioxide. Add water until a very thick paste is formed.

3. Spread a layer of this mixture about 1/8 in. (2 mm) thick on the copper or brass plate. Be sure mixture Is thick enough so that when mixture is sandwiched between two metal plates, the plates will not touch each other at any point.

NOTE: If mors power is required, prepare several plates as above.


1. Just prior to use (no more than 15 minutes), carefully pour s small quantity of sodium hydroxide solution over the mixture on each plate used.

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