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The B. P. says: "A mixture of 5 volumes with sufficient alcohol (90%) to form 100 volumes affords a liquid of which a portion tested in a nitrometer, as described under "Spiritus Aetheris Nitrosi," should yield not less than six times its bulk of nitric oxide gas." This is equivalent to about 66 percent. by weight of pure amyl nitrite. This also is a standard easy of attainment, in fact it is decidedly too low. A sample which will meet the distillation test will more than respond to this assay.doi:10.1002/jps.3080031023 fatcat:oxq3tt63ynbkfpn5y7w2br2h3y