A: To about 5 mL of Aerosol spray, collected in a separator, add about 10 mL of water and 3 mL of dilute hydrochloric acid (1 in 2), wash with two 15-mL portions of chloroform, and discard the chloroform washings. Render the solution in the separator alkaline with 5 to 6 mL of ammonium hydroxide, and extract with three 20-mL portions of chloroform, filtering the chloroform extracts through a pledget of cotton previously moistened with chloroform. Evaporate the combined chloroform extracts with the aid of gentle heat to dryness, and dry the residue in vacuum over silica gel for 24 hours: a potassium bromide dispersion of the lidocaine so obtained exhibits maxima only at the same wavelengths as that of a similar preparation of USP Lidocaine RS.

B: To about 2 mL of Aerosol spray, collected in a test tube, add 10 to 15 drops of cobaltous chloride TS, and shake for about 2 minutes: a bright green color develops, and a fine precipitate is formed (lidocaine).

C: To about 2 mL of Aerosol spray, collected in a test tube, add 5 mL of water, 1 mL of 2 N nitric acid, and 3 mL of mercuric nitrate TS: a light yellow color develops (lidocaine).