Titanium dioxide is a white pigment used in a wide range of products such as paints, plastics, cosmetics and foodstuffs. Titanium is extracted from a type of sand, called ilmenite, using sulfuric acid before being reformed as titanium dioxide. It is then coated and ground to a consistent particle size before being dispatched for use as a pigment.

This process leads to waste Iron Sulfate which can be used in the treatment of drinking water. If waste iron sulfate solution is neutralised with Calcium Oxide (lime), it produces red gypsum for use as a soil conditioner on local farms. Neutralising waste acid with Calcium Carbonate (chalk) produces Calcium Sulfate, called white gypsum, that can be sold as a raw material in the manufacture of plasterboard or cement.

The Huntsman Tioxide plant at Grimsby has reduced the amount of Gypsum sent to land-fill by nearly 60% between 1997 and 2001.

Globally, Huntsman Tioxide produce over 1 million tonnes of gypsum each year. Re-using this co-product not only saves waste but also helps to reduce the depletion of natural gypsum through mining.