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i just freeze a 3% solution for 7 hours. whatever liquid is not frozen, that is 10-30% h2o2. defrost the ice and repeat process as much as needed. you'll have about 20-40 ml of 10-30% h2o2 when done. beware it takes several days.

this stuff is corrosive too, have great care

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13y ago
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Q: How do you concentrate hydrogen peroxide?
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