colloidal titanium dioxide

Furthermore, titanium dioxide imparts excellent brightness and opacity to plastics, which is crucial for achieving a consistent, high-quality appearance. It helps to mask any impurities or irregularities within the plastic material, resulting in a more attractive and marketable product. For example, in the production of white or light-colored plastic goods like appliances, packaging materials, and toys, TiO2 ensures an even, lustrous finish that consumers find appealing.

...

1. The process for preparing from solution, lithoponeof various grades and a soluble commercial byproduct preferably of sodium, which consists in preparing separate solutions of zinc sulfate and barium'sulfid, which solutions are mixed with each other and with that of a third salt adapted to enter into combination with a freed acid group from the firstnamed salts, the same being brought together in equivalent and calculated amounts to produce and precipitate lithopone of the desired percentage, and leave in solution the soluble by-product, substantially as described.

...