1, methyl salicylate is a colorless to light yellow or reddish oily liquid, with a wintergreen flavor, also known as "wintergreen oil".
2, menthol is extracted from the leaves and stems of peppermint, white crystals, for peppermint and peppermint essential oil in the main components.
3, camphor for the camphor plant camphor branches, trunk, leaves and roots, by refining the granular crystals. Camphor pills are divided into natural camphor pills and synthetic camphor pills. Natural mothballs are smooth colorless or white crystals, the smell is fragrant, will float in the water; synthetic mothballs is an organic compound containing naphthalene mothballs are mostly white, pungent odor, and sink in water.