... 51-5Properties:Colorless needlelike crystals, Having Characteristic Odor Of Asian Natural Menthol Obtained From Menthol Avensis Oil.Specification:BP2008 USP31Melting Point ... camphor, of chloral hydrate, or of phenol, the mixture liquefies. Organic Volatile Impurities, Method V (467): Meet the requirements, dimethyl sulfoxide ... and dry places, Below 33C, avoid sunshine and rain Natural menthol crystal