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In conclusion, chemical product manufacturers are an integral part of modern society. Their contributions span numerous industries and touch every aspect of our lives. From healthcare and agriculture to household goods and technological advancements, these companies continue to drive progress and improve our quality of life. As we move forward into an increasingly complex world, their role will only become more critical, underscoring the importance of continued investment and innovation within the chemical industry.

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In 1970, Japanese scholars studied the phase diagram of iron oxide microcrystalline formation, which laid a theoretical foundation for the preparation method of iron oxide yellow crystal seed. According to the research results, iron yellow crystal seeds can be formed under acidic or alkaline conditions. Because iron yellow is a crystal structure, in order to crystallize into pigment particles, it must first form crystal nucleus and become crystal seed, and then the crystal nucleus grows into iron yellow. Otherwise, only thin and dim color paste can be obtained, which does not have pigment properties. Acid process can be divided into iron sheet process and drop addition process.

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