Leon Ehrmann became a member of the Chemical and Metallurgical Society of South Africa in 1895, the year after its formation. In April 1897 he read a paper before its members on "Precipitation of gold from cyanide solutions", which was published in the society's Proceedings (1897, Vol. 2, pp. 38-45). In May 1899 he read a second paper, "Notes on sampling, analysing and treating of slimes" (Proceedings, 1899, Vol. 2, pp. 697-705). After the Anglo-Boer War (1899-1902) he remained a member of the now renamed Chemical, Metallurgical and Mining Society of South Africa until at least 1905, by which time he was consulting chemist to the Queensland Meat Export and Agency Company in Brisbane, Australia.