h2o2 from wood bleach kit

[homeslice]

How fast does 30% h2o2 go bad after opening it? Swim ran a pbenzo from hydro via h2o2 synth today and made quinhydrone yet everything was the exact same way as prescribed by bond

Post 473279

(Bond_DoubleBond: "Big Breakthrough for Benzo Bees", Methods Discourse)
Worked before except this time when the h2o2 was added in the addition funnel, bubbles on the walls of the funnel were not observed as usual. Swim guess the bottle is about 3 weeks old after being opened and has been closed for those weeks. Also this brand and bottle of h2o2 worked before.

[terbium]

It would be hard to answer how fast your peroxide decomposes, this depends on too many variables. If the peroxide is very pure and kept cool it might decompose very little over many months. OTOH, just a little bit of the right contaminant and high temps could cause it to completely degrade in just a few days.

[homeslice]

swim thinks it degraded

so as a rule of thumb, to prevent degredation, swim should keep his chems relatively cool?

[Organikum]

Thats the way to store chemicals. And use only very well cleaned plasticspoons to get stuff out of a container - better pour the stuff out. A few metal ions can catalyze the decomposition of rather big amounts of certain compounds very fast.
Also never put back stuff which was poured outa the bottle but store thus seperately, so you loose in case of contamination only a little bit and not all you have.