Word: cobalt
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...packaging, bags of silica gel are enclosed with the packed object in a vapor-proof wrapping like Pliofilm or reinforced Cellophane. To show whether the air inside is keeping dry enough, the silica gel is impregnated with cobalt chloride, which turns pink if humidity rises above 30%-the point at which metal begins to rust. After unwrapping, silica gel can be dried and used again...
There were ships as far as you could see on the cobalt blue water; the landing barges looked like squirming black fish streaming in & out from the shore. Destroyers were laying down smoke screens to help the landing craft approach safely. The screens mingled with clouds of smoke from the burning land, where shells had spread fires in the dust-dry countryside; everything that could burn was alight...
...Cobalt...
...counts upon Mexico for 45% of its requirements of graphite, 33% of its antimony, 40% of its sisal and henequen, 19% of its lead, a growing portion of its lumber (particularly mahogany, for plywood planes), plus important fractions of its needs for molybdenum, mercury, cobalt, manganese, mica, tungsten, tin, vanadium. This year Mexico will ship the U.S. some 400,000 tons of these metals alone; next year the figure should rise to nearly 2,000,000 tons...
Africa's contribution in raw materials and manpower to the United Nations cannot be in proportion to its size, but what resources Africa has are precious. The Belgian Congo and Northern Rhodesia are the world's principal sources of cobalt, used in hard steel for toolmaking. Vanadium and manganese, also necessary for steel, come from the Gold Coast and South Africa. Tin comes from Nigeria, industrial diamonds from the fabulous Transvaal mines, rubber from Liberia, copper from the Congo...