Both Gregor And Klaproth labored with titanium compounds. The main important isolation of almost pure titanium was completed in 1875 by Kirillov in Russia. Isolation of the pure metal was not demonstrated right until 1910 when Matthew Hunter and his associates reacted titanium tetrachloride with sodium in the heated steel https://stephenbddbb.wikigdia.com/7171935/not_known_factual_statements_about_cuprous_oxide