Salicylic acid is derived from willow bark, says cosmetic chemist Ron Robinson, and it belongs to a class of ingredients called salicylates. It's structure is a little complicated, but understanding it is important to learning why (and how) it works so well.When it comes to skin-care products, ther

Physical properties of pure salicylic acid Appearance and properties: white needle-like crystals or hairy crystalline powder. Solubility: Easily soluble in ethanol, ethylene, dilute chlorine, slightly water, and dissolves in boiling water. Melting point: 159°C Boiling point: 211℃, sublimation at 76℃