This is a qualitative method, and you’ll never know what concentration you’re getting. Because hydrogen peroxide boils at 150☌, they’re simply boiling off the water and increasing the concentration of peroxide. There are a few YouTube videos of kitchen chemists concentrating peroxide by heating it on a stove to just under 100☌. That’s alright with, though, because he’s come up with a way to concentrate peroxide and measure the concentration once he’s done. Unfortunately for the home hacker, it’s very difficult and expensive to obtain peroxide in concentrations above 3% or so. At concentrations of about 30%, it’s perfect for etching PCB boards, and at even higher concentrations – about 70% – it can be used as rocket fuel. Hydrogen peroxide – the same stuff you can pick up from a drug store or beauty supply store – is one of those very interesting chemicals that belongs on every maker’s cabinet.
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