A process for increasing the bulk density of an aerated powder is
provided. The powder is placed in a container. The container is then
closed and the gas pressure within the container is increased to a level
above atmospheric pressure and at a rate sufficient to cause the powder
to compact before a substantial portion of said pressurization gas
diffuses into said powder. In one embodiment, the process is utilized to
increase the bulk density of an aerated, free-flowing titanium dioxide
pigment. Apparatus for carrying out the process is also provided.