伊藤征司郎、田中睦浩与桑原利秀报道了一种制备粒度小于80(?)的透明超微氧化铁(Ⅲ)颜料的胶体化学方法。由硫酸铁(Ⅲ)与碳酸钠溶液制成的Fe(OH)_3沉淀。用 FeCl_3使之胶溶后,加入阴离子表面活性剂使之与这种带正电的溶胶发生聚沉。所用表面活性剂有:十二烷基苯磺酸钠、己酸钠、辛酸钠与十二碳酸钠。凝胶粒通过振荡使转入有机溶剂中,然后用 Ito Shizo Lang, Murano Tanaka and Sanghara Lee show a preparation of colloidal chemical methods of transparent ultrafine iron (Ⅲ) pigment particle size less than 80 (?). Fe (OH) 3 precipitates made from iron (III) sulfate and sodium carbonate solution. After peptizing with FeCl_3, an anionic surfactant was added to cause coagulation with this positively charged sol. Surfactants used are: sodium dodecyl benzene sulfonate, sodium caprate, sodium caprylate and sodium dodecyl sulfate. The gel particles are transferred to the organic solvent by shaking and then used