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Courseware on how the substance dissolves in water (grade 4 of the science edition of the textbook) Deep purple slender rhombic columnar crystal with a blue metallic luster Easily soluble in water, the aqueous solution is unstable. It decomposes when exposed to light, and produces gray-black manganese dioxide precipitates and attaches to the utensils. Can be used as disinfectant and bleach. Inhalation can cause respiratory tract damage. Splashing into the eyes, irritating the conjunctiva, severe cases cause burns. Irritating to the skin. Concentrated solutions or crystals are corrosive to the skin and irritating to tissues, which can easily contaminate the skin and cause blackness.