White crystal or offwhite powder,undissolving in water or alcohol,dissolving in concentrated sulphuric acid or hydrochloric acid or ammonia or potassium iodide.

• 性状Properties:白色结晶或灰白色粉末,见光易分解变成棕黄色。不溶于水和乙醇。溶于浓硫酸和盐酸，亦溶于氨水、碘化钾。