Titanium dioxide is mainly used as a white pigment base in paints . Pigment grade titanium dioxide may be prepared by either sulphate or chloride process because the naturally occurring rutile is colored by impurities like iron e.t.c .
In this case, it has replaced {PbCO3.Pb(OH)2} due to the fact that;
- White lead forms PbS ( lead sulphide) which is black in industrial atmosphere during production or weathering of paint.
- Lead is toxic .
- TiO2 has high refractive index in the visible region of the spectrum and is chemically inert (unreactive) .
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