A simple inflammable body. Its fusing point is 220° Fahr. after which it begins to evaporate; at 560°, it takes fire in the open air, and burns with a pale blue flame: kept melted in an open vessel at 300°, it becomes of a red colour, thick, viscid, and plastic, like wax, and is used by seal engravers to take off impressions from their work. Its great utility in the arts is too well known to need specifying.