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Although barium sulfate is almost completely inert, zinc sulfide degrades upon exposure to UV light, leading to darkening of the pigment. The severity of this UV reaction is dependent on a combination of two factors; how much zinc sulfide makes up the pigments formulation, and its total accumulated UV exposure. Depending on these factors the pigment itself can vary in shade over time, ranging from pure white all the way to grey or even black. To suppress this effect, a dopant may be used, such as a small amount of cobalt salts, which would be added to the formulation. This process creates cobalt-doped zinc sulfide. The cobalt salts help to stabilize zinc sulfide so it will not have as severe a reaction to UV exposure.

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In conclusion, China's domination in rutile titanium dioxide manufacturing is a testament to its advanced manufacturing capabilities, vast reserves of raw materials, and well-developed infrastructure. While facing challenges such as environmental concerns, the industry remains a key driver of China's economic growth and a major contributor to the global supply chain. As the demand for rutile titanium dioxide continues to grow, China is well-positioned to maintain its leading position in this vital sector.

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