Achromatic power, also known as tinting power, usually it named tinting strength for pigment, achromatic force for tio2.
The small particle size of tio2 is conducive to uniform dispersion (0.05-0.1) and improving the color-reducing power; however, if the particle size is too small, the transparency will increase, hiding power decreases, and the achromatic power decreases.
1. IF the particle size of the filler is larger than that of titanium dioxide, tio2 reducing power decreases as per the filler quantity increases ;
However, if the particle size of the filler is smaller than that of titanium white, tio2 reducing power tends to increase as per the increasing of the filler amount .
2. The platy filler is more conducive to dispersion, so adding the same amount of flaky filler (talc powder, kaolin) , leading to a better dispersibility and better achromatic power than the spherical titanium dioxide with the same amount of particles.