National Geographic : 1983 Jul
At numerous sites the Leakeys found prehistoric"crayons" -sticks of pigment mixed with animalfat. The predominant red was made from ocher, which is derived from iron ore. Black probably camefrom manganese, and bird droppings may have provided the basisfor the white. Louis Leakey's 1951 photograph(right) shows the authoron a scaffold at the Kolo site. To reproducesome 1,600 paintings,she traced scenes on cellophane taped to the rock, then reduced the tracings to half size. Mary Leakey's 128-page volume, Africa's Vanishing Art, will be published in October by Hamish Hamilton/Rainbird in London and Doubleday & Co., Inc., in New York.