Comparative electron microscopy particle sizing of TiO pigments: sample preparation and measurement.

Titanium dioxide (TiO) pigment is a non-toxic, particulate material in widespread use and found in everyone's daily life. The particle size of the anatase or rutile crystals are optimised to produce a pigment that provides the best possible whiteness and opacity. The average particle size is intentionally much larger than the 100 nm boundary of the EU nanomaterial definition, but the TiO pigment manufacturing processes results in a finite nanoscale content fraction.