5. Cyanide Test: Test a mixture of 5 ml Type I polish or 5 grams Type II polish and 5 ml distilled water with litmus paper. If necessary, add sodium hydroxide solution to make the mixture alkaline. Then add three drops each of ferrous sulphate and ferric chloride (10 percent solutions, w/w); mix and heat to a temperature of 49oC in a hot water bath. Make the mixture acid to litmus by the addition of 12 MHCI. If cyanides are present a blue precipitate is formed.
Copies of ASTM methods are available from the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.
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