Characters and features: red powders, fine particle, in good dispersancy, good impenetrability to ultraviolet ray, stable in atmosphere and sunlight, good light resistance, good thermal endurance, good alkali resistance, dissolved only in hot strong acid.

• 性状特点：为红色粉末，粉粒细腻，分散性良好，对紫外线有良好的不穿透性，在大气和日光中较稳定其耐光、耐热和耐碱性良好，仅溶于热的强酸中。