Paraffin wax is obtained from petroleum by dewaxing light lubricating
oil stocks. It is used in candles, wax paper, polishes, cosmetics, and
electrical insulators. It assists in extracting perfumes from flowers,
forms a base for medical ointments, and supplies a waterproof coating
for wood. In wood and paper matches, it helps to ignite the matchstick
by supplying an easily vaporized hydrocarbon fuel.
The type of glass used in making lenses and prisms is