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~ Dee

Does glycolic acid expire?

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I bought some a few years ago & I still have it. It's in a cobalt blue glass jar.. There's no expiration date on it.


... for doubt and secrecy are the lure of lures, and no new horror can be more terrible than the daily torture of the commonplace. - H.P. Lovecraft

"You people are a bunch of fickle mushheads!" -Mayor Quimby


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Yes I think it weakens over time. I bought one with 30% concentration 2 years ago and its weakened considerably since then so I had to buy another one.

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Thanks. I'm not real sure how many years old it is, I know it's over two... Think I'm gonna toss it.


... for doubt and secrecy are the lure of lures, and no new horror can be more terrible than the daily torture of the commonplace. - H.P. Lovecraft

"You people are a bunch of fickle mushheads!" -Mayor Quimby


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Thanks. I'm not real sure how many years old it is, I know it's over two... Think I'm gonna toss it.

Hydroxyacetic acid has a half life of 373.8 days.

So, it takes about 7 years for it to become about 0.75% concentration.

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