On distillation in a current of superheated steam, ozokerite yields a candle-making material resembling the paraffin obtained from petroleum and shale-oil but of higher melting-point, and therefore of greater value if the candles made from it are to be used in hot climates. There are also obtained in the distillation light oils and a product resembling vaseline. The residue in the stills consists of a hard, black, waxy substance, which in admixture with India-rubber was employed under the name of okonite as an electrical insulator. From the residue a form of the material known as heel-ball, used to impart a polished surface to the heels and soles of boots, was also manufactured.