ties than will be imparted by spirits of turpentine.

However, paints containing benzine tend to thicken up when allowed to stand open, due to evaporation of the light thinner. Other drawbacks to its use are its inflammable nature, and the fact that its low price may in many instances lead to its excessive use, in which case it is an injury to paint.

Painters' Japans and Siccatives, or Driers.—Paints dry by evaporation and by oxidation. The function of driers of any kind is to increase the rate; they are usually made from lead or manganese oxides cooked in oil, and then reduced with some solvent like spirits of turpentine or naphtha. Resin is frequently added to harden the oil. Resin causes the japan itself to dry more rapidly, but reduces its power to dry oil paint. Present conditions often demand  quick-dry-