I am using Improved Hummer method.

Graphite: 1 gr

KMnO4: 6gr

H2SO4: 120ml

H3PO4: 13 ml

My mixture was on the stirrer for 12 hours (50 degree) and the color had turned to brown. I removed the stirrer and put the ice in it. The temperature went up. I waited till it went down. Then I added 3 ml H2O2 (30%) but the color turned to violet instead of yellow-brown. Why?

What should I do?

Is it possible if the reaction wasn't completed? That all KMnO4 hadn't reacted?

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