How do you test if H2O2 is still "fresh"?

[Labtechie70]

Hi Guys,

I have done a search on the forum, but there isn't a mention of how one can test if a peroxide solution
is still effective.

Does anyone have a quick and easy test for this? Typically on 3% and 6% solutions.
Thanks!

Regards

[shaz.H]

put some manganese dioxide in it, if it fizzes it's ok
shaz

[Labtechie70]

Thanks so much, it works!