What do they use white chalk for in things fall apart?

Answer 1

"'It is like the story of white men who, they say, are white like this piece of chalk,' said Obierika. He held up a piece of chalk, which every man kept in his obi and with which his guests drew lines on the floor before they ate kola nuts." (Things Fall Apart 74)

Answer 2

White chalk is used by the Ibo people in "Things Fall Apart" as a symbol of purity and divination. It is often used by the priest or oracle during rituals to communicate with spirits or ancestors. White chalk is also used in traditional ceremonies and to mark important locations.