An important adulterant, which should always be tested for, is acetanilide (antifebrin), which may be detected by the characteristic isocyanide odour produced when musk containing this substance is boiled with alcoholic potash, and a few drops of chloroform added. Acetanilide also increases the solubility in 95 per cent. alcohol. _Neroli Oil (Artificial)._--Like jasmine oil, the chemistry of neroli oil is now very fully known, and it is therefore possible to prepare an artificial product which is a very good approximation to the natural oil, and many such are now on the market, which, on account of their comparative cheapness, commend themselves to the soap-perfumer. These consist chiefly of linalol, geraniol, linalyl acetate, methyl anthranilate, and citral. _Mirbane Oil_ or _Nitrobenzene._--This is a cheap substitute for oil of bitter almonds, or benzaldehyde, and is a very coarse, irritating perfume, only suitable for use in the very cheapest soaps. It is prepared by the action of a mixture of nitric and sulphuric acids on benzene at a temperature not exceeding 40 deg. C. Its specific gravity is 1.205-1.206; refractive index at 20 deg. C., 1.550; and boiling point, 206 deg. C. _Niobe oil_, or _ethyl benzoate_, the ester obtained from ethyl alcohol and benzoic acid, and having the specific gravity at 15 deg. C., 1.094-1.095; refractive index at 20 deg. C., 1.5167; boiling point, 196.5 deg.-198 deg. C.; soluble in 1.5 volumes of 70 per cent. alcohol. _Oeillet_ is a combination possessed of a sweet carnation-like odour and having as a basis, eugenol or isoeugenol. Its properties vary with the source of supply. _Rose Oil (Artificial)._--Several good and fairly cheap artificial rose oils are now obtainable, consisting chiefly of citronellol, geraniol, linalol, phenyl ethyl alcohol, and citral. In some cases stearopten or other wax is added, to render the oil more similar in appearance to the natural article, but as these are inodorous, no advantage is gained in this way, and there is, further, the inconvenience in cold weather of having to first melt the oil before use. _Safrol_, an ether which is the chief constituent of sassafras oil, and also found in considerable quantity in camphor oil. It is sold as an artificial sassafras oil, and is very much used in perfuming cheap toilet or household soaps. Its specific gravity at 15 deg. C. is 1.103-1.106; refractive index at 20 deg. C., 1.5373; and it dissolves in fifteen volumes of 80 per cent. alcohol. _Santalol_, the alcohol or mixture of alcohols obtained from sandalwood oil. Its specific gravity at 15 deg. C. is 0.9795; optical rotation, -18 deg.; and refractive index at 20 deg. C., 1.507.