GENERAL INFORMATION.

New Zealand Herald, Volume LXIII, Issue 19502, 4 December 1926, Page 4 (Supplement)

GENERAL INFORMATION.

BT ANNETTE BEVAH, •

Tnk: A liquid pigment ordinarily made from an infusion of nut-galls, coppisras, and gum arabic. Bhumac is substituted for nut-galls for inferior inks. An acid is sometimes added to prevent oxidation, and for the blue-black inks. A small quantity of solution of indigo serves for colouring. Copying ink contains glycerine or sugar, which keeps the ink moist. Lampblack is the leading ingredient in printers' ink. For red, blue, and other coloured inks, colouring solutions are used. Marking ink is composed of a solution of nitrate of silver, gum, ammonia, and carbonate of soda. Lead: A soft flexible metal occurring in numerous ores, which are easily smelted. lit is found in its native form, in small quantities in Sweden. Lead is largely used in the making of service pipes, on account of its pliability, and as an alloy element it combines in the formation of type-metal, stereo-metal, shot-metal, pewter, ,and many other compounds. Lead mining is carried on in several of the northern counties of England, and in Wales. Our chief imports of lead are from Spain. The load output of the world now averages over 1,000,000 tons per annum, of which about one fourth is raised within the British Empire, Australia being the chief British lead-producing region. Dew: The vapour which collects in small drops on the surfaces of substances by atmospheric condensation, chiefly in the night time. It is most abundant in bodies that are not conductors of heat, such as grasses, etc.