Before revision: US patent 2,081,121 In 1868, Puscher reported on the application of multicolored or lustre patina based on sodium thiosulphate and lead acetate for the first URL Retrieved 7.02.
After revision: In 1868, Puscher reported on the application of multicolored or lustre patina based on sodium thiosulphate and lead acetate for the first URL Retrieved 7.02.