Turpentine stains are chiefly solutions of oil-soluble coal-tar dyes in turpentine oil, with small quantities of wax also in solution. They do not roughen the wood, making a final polishing unnecessary. They enter the wood slowly, so that an even stain, especially on large surfaces, is secured. The disadvantages of turpentine stains are the lack of permanence of the coloring, when exposed to light and air, and their high price.