I've tried Acetic-Picral (5 mL Acetic Acid, 6 g Picric Acid, 10 mL Water, 100 mL Ethanol) and also a solution of 5ml acetic acid, 6g picric acid, 10ml water, 100ml ethanol, 5 ml HCl and 7 ml nitric acid for 1–2s, But it didn't work....

Any suggestions?

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