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Mica is a naturally occurring silicate mineral that has a layered structure, which gives it unique optical properties. When used in shampoo, mica provides a shimmering and reflective effect, making hair appear more vibrant and shiny. This is particularly appealing to consumers who desire a high-gloss finish. Additionally, mica is known for its ability to absorb oil and dirt, making it an effective ingredient in cleansing formulations.

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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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