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Titanium dioxide can be both safe and unsafe, depending on its use. When inhaled, titanium dioxide is considered possibly carcinogenic to humans. This means that in products that contain powdered titanium dioxide like loose powders, pressed powders, eyeshadows, and blushes in which the makeup is in powder form, titanium dioxide can be inhaled. Titanium dioxide is also an occupational chemical of concern, as workers might inhale titanium dioxide when manufacturing products.

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Here, NaOH or NH3 · H2O is used as a precipitant or pH regulator to react with FeSO4 to form ferrous hydroxide precipitation; Air is used as oxidant; The iron sheet reacts with sulfuric acid produced during the oxidative hydrolysis of FeSO4 to provide ferrous ions required in the reaction system and maintain the pH value of the solution. The alkali consumption of acid method is less and the particles are easy to wash. The relative rates of seed preparation and crystal growth determine the particle size, particle size distribution and particle morphology of iron yellow particles.

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For manufacturers, the use of dimethicone and titanium dioxide offers several advantages. Firstly, these ingredients are relatively inexpensive and easy to source, making them an attractive option for budget-conscious consumers. Secondly, they are versatile and can be used in a wide range of cosmetic products, allowing manufacturers to create a diverse product line that appeals to a broad audience. Finally, the combination of dimethicone and titanium dioxide provides excellent stability and consistency, ensuring that the final product performs as intended.

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