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The crystal with green luster is reddish brown powder after grinding. Soluble in alcohol and dilute sodium hydroxide solution, slightly soluble in water. Acid and alkali reminder. Prepare 0.1% solution or 0.04% aqueous solution with 20% ethanol (dissolve 0.04g of the product in 1.05ml0.1mnaoh solution), and then dilute to 100ml. PH discoloration range: 7.2 (yellow) - 8.8 (purple red); 2.0 (red) - 3.0 (Amber)
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