Titanium dioxide is a well-known substance, which is used in many consumer products: paint, plastics, paper and food, as well as cosmetics. It is a naturally occurring mineral that can form many different shapes.
Titanium dioxide is generally a white powder, which gives products a white hue. However, its nanoform does not have the same characteristics and no longer gives this white colour.
According to the definition found in Regulation (EC) No 1223/2009, nanomaterials are insoluble or bio-persistent materials, which are intentionally manufactured to have one or more external dimensions, or an internal structure on the scale from 1-100nm.
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