Colophony

Rosin is a kind of oil tree pine resin in the pine family plant, the main component is C19H29COOH. There are 3 types of "gum rosin", "wood rosin" and "slick rosin". It is often used as a depilatory by poultry slaughterers. Rosin itself is not very toxic to the human body, but it often contains heavy metals such as lead and toxic compounds. In addition to the repeated use of the industry for low cost, the peroxide produced by the oxidation of rosin seriously affects human health, so it becomes a regulated product.

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