Reversible copper (II) tartrate complex reduction to copper (I) using peroxide

A rich blue copper (II) complex is converted to copper (I) through reduction by peroxide. As the mixture is cooled upon addition of more peroxide the copper (I) oxidizes back to the blue copper (II) before repeating the reduction. #shorts

[@SodiumInteresting]

Very nice demo, I've not seen this before

[@sachinnanda3028]

Sir which chemical use to repel needle on near the copper coin