Antimonite of lead

Naples yellow n. A light yellow pigment the true pigment is a basic antimonite of lead, but is imitated by mixtures. Syn galliolino and antimony yellow. 

Riffault et al. (1874) describe the preparation of Antimonite of lead as follows boil 50 parts metallic antimony with 20 parts of concentrated sulfuric acid to give antimony sulfate. Heat this until there are no more acid fumes. Calcine the result with 21 parts dry sodium carbonate. Finally boil the fused product with water and add neutral lead acetate. The result is lead antimonite. Bersch (1901) also provides essentially the same recipe, though giving only five parts of antimony he also describes it (and lead antimoiriate ) as a heavy, white powder... dearer than white lead [. v.] to which [it] is inferior in covering power, and which [it does] not exceed in permanence . 

---