Alcohol for lighting, heating, or motor power may be denatured with 2 per cent.of wood naphtha containing 30 per cent. of acetone; benzine may be further added in quantity to suit the trader's requirements. Alternatively, a denaturing mixture composed of one-half of benzine and one-half of wood naphtha including 30 per cent. of acetone may be employed.


Wood naphtha and pyridine bases are used as denaturants. Special denaturing is accorded in certain manufactures, including those of alkaloids, chloral, chlorofoim, fulminates, tannic acid, and varnish.


Alcohol is allowed free of duty if denatured either with wood naphtha or with other substances which will prevent the alcohol being used for potable purposes. The expenses of denaturing and supervision devolve upon the trader.