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H2O2 stability - (Nov/14/2011 )

I have very old H2O2, may be more than 3 or 4 years, do you recommend it in peroxidase blocking and Dab staining in immunohistochemistry?

-attayeb-

i've used older (for dab staining). how was it stored? we store 30% peroxide tightly capped at 4C.

-mdfenko-