| abstract |
The invention provides a pigmentary particulate material selected from the group consisting of titanium dioxide, doped titanium dioxide and a mixture thereof, wherein the particulate material has a mean crystal size in the range of from 0.3 to 0.5 microns and a crystal size distribution such that 40wt% or more of the particulate material has a crystal size in the range of from 0.3 to 0.5microns, and wherein the ratio of the mean particle size to the mean crystal size is 1.25 or less. The particulate material may be used in a composition comprising pigmentary material dispersed in a vehicle, to provide improved opacity for said composition. |