It's hard to determine the total amount of food products that have titanium dioxide because federal regulations don't require all producers to list its use on ingredient labels, but the list of foods containing the substance certainly doesn't end with Skittles.

Lithopone was developed in the 1870s as a substitute for lead carbonate (lead white), to overcome its drawbacks of toxicity and poor weathering resistance. Within a few years, titanium dioxide displaced lithopone to become the white pigment (PW6) par excellence in the industry and the world’s best-selling inorganic pigment. However, titanium is a product whose price is subject to large price variations due to product availability. These price increases affect the competitiveness of finished products, and so the search for an alternative to titanium dioxide has generated a variety of possibilities to optimise its use. 

1. Using roasting and leaching method. The reaction equation is as follows: