Treatment of pigment

A process for the treatment of titanium dioxide pigment which comprises forming an aqueous dispersion of titanium dioxide containing as a dispersant 0.1% to 0.3% by weight of monoisopropanolamine, a water-soluble phosphate in an amount of 0.05% to 0.5% by weight expressed as P.sub.2 O.sub.5 or a mixture thereof, or a water-soluble silicate in an amount of 0.1% to 0.5% by weight expressed as SiO.sub.2 used alone or together with monoisopropanolamine and/or the phosphate, adding to the aqueous dispersion a water-soluble phosphate in an amount of 0.05% to 1.0% by weight expressed as P.sub.2 O.sub.5 when the dispersing agent is not solely a phosphate, a water-soluble hydrolysable acidic compound of zirconium in an amount of from 0.2% to 2.5% by weight expressed as ZrO.sub.2, a water-soluble hydrolysable acidic compound of aluminium in an amount of from 0.2% to 2.5% by weight expressed as Al.sub.2 O.sub.3, a water-soluble compound of silicon in an amount of from 0% to 1% by weight expressed as SiO.sub.2, and a water-soluble hydrolysable alkaline compound of aluminium in an amount of 0.5% to 2.5% by weight expressed as Al.sub.2 O.sub.3, and adjusting the pH of the dispersion, if necessary, to a value of pH 6.5 to 8.5 prior to recovering the treated pigment from the dispersion will all the percentages by weight being based on the weight of titanium dioxide in the aqueous dispersion.