testo=<B>Titanium</B><BR>Titanium was discovered in England in 1791 by pastor William Gregor who recognized the presence of a new element in ilmenite. Years later, this element was ridiscovered by the German chemist Klaproth in rutile and baptized titanium i.e. named after the Titans of Greek mythology. Pure metallic titanium was first prepared in 1910 by Matthew A. Hunter. <BR>It was only proved in 1946 by William Justin Kroll that titanium could be produced by reducing titanium tetrachloride with magnesium. Titanium is well-known for its corrosion resistance and its strength-to-eight ratio. It is  a leightweighted and hard metal. Pure titanium is ductile and lustrous. Titanium alloys are not easily processable. Titanium is usually used in the titanium dioxide from the make paints, paper, cement to brighter and in plastic. Due to their resistance, lightness and ability to withstand extreme temperatures titanium alloys are particulary used in the aerospace and aeronautic industry.<BR>Besides titanium is often alloyed with aluminum, iron, magnesium, molybdenum and other metals.