This was to pay over the bottoms with stuff containing poisonous substances such as sulphur, and sometimes pulverised glass.
yayiza kuhlawulwa ngaphezulu komphantsi ingxalwe inento yokwenza ubungozi uyakutsho kwzinto ezibubanzi eziza kuthi ziqutywe izinto ezinjenge salfa ngamanye amaxesha kucolwe iglasi.