(a) Alkalinity. Strongly alkaline to litmus.
(b) Ammonia content. 27 to 30 percent by weight. Accurately weigh a glass-stoppered flask containing 25 ml of water, add about 2 ml of the sample, stopper, and weigh again. Add methyl red indicator, and titrate with 1 N sulfuric acid. Each ml of 1 N sulfuric acid is equivalent to 17.03 mg of NH3
(c) Color. Colorless liquid.
(d) Non-volatile residue. 2 mg maximum. Dilute a portion of the sample with 1\1/2\ times its volume of distilled water. Evaporate 10 ml of this product to dryness in a tared platinum or porcelain dish. Dry residue at 105 [deg]C. for 1 hour, cool and weigh.
(e) Odor. Characteristic (exceedingly pungent).
(f) Specific gravity at 20 [deg]/4 [deg]C. 0.8920 to 0.9010. [T.D. ATF-133, 48 FR 24673, June 2, 1983. Redesignated by T.D. ATF-442, 66 FR 12854, Mar. 1, 2001]