SWIM left a beaker with a bit of post-H2SO4 hydrolyzed ketone (or at least he hoped it was 'tone!!) from a peracetic in a beaker wraped in al foil for 2 months, no freezer, but the room was kinda coldish - temp wouldnt have gone above 15C in that time. Everything was in the beaker - no purification at all. Just neutralized the H2SO4 w/ NaOH soltn., wrapped in foil and left it. Came back and for the hell of it did a bisulfite - big lump of chicken fatty stuff came out. He did an IR on it, and despite all the crap there was defnately a ketone peak. so maybe ketone's not all that unstable... I mean, if it had been summer, probably a different story, but at least winter's good for something
(and to think he thought the peracetic failed! course, it could have been some other fucked up thing, but who knows)