How many of you ladies here have a serious attack of rash and redness post-waxing? *Counting hands*. Ok everybody. I thought so! Rosin, also known as colophony, is the sap or sticky substance that comes from pine and spruce trees. Its “stickiness” lends itself to being used by many companies to produce hair removal waxes. Colophony is well recognized as a skin sensitizer and cause of allergic dermatitis. Rica wax is 100% Colophony Free.