Titanium metal was not used outside the laboratory until 1932 when William Justin Kroll proved that it can be produced by reducing titanium tetrachloride (TiCl4) with calcium.
O metal de titanio non foi empregado fora dos laboratorios ata 1932 cando William Justin Kroll probou que podía producirse mediante a redución de tetracloruro de titanio (TiCl4) con calcio.