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What kind of post-treatment of titanium dioxide can increase the hiding power of titanium dioxide by

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The content of titanium dioxide in the color masterbatch is the same, but the hiding power of the product produced by adding two color masterbatches in the production is as much as twice as that of the product. I encountered this situation twice, both in the production of sheet manufacturers, one is PS , One is PET, is there any secret recipe to increase the hiding power of titanium dioxide by 100%?