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Reply To: Blue sapphire

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Dear sir
You may keep it in oxalic acid. Oxalic acid is a powder. Put two teaspoons of oxalic powder in 50 ml water.Once the powder dissolves , you can put the Sapphire in it. Keep the reaction in a glass beaker, beware it is not a metal. The reaction will be very slow but you can get some improvement in blue colour only after say a week or fortnight. The improvement will be very small that can hardly be visualized with the unaided eye. You can only measure the increase in colour by color flex colorimeter prepared by Hunter Lab USA

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