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10 November 2014 @ 10:46 pm

To those of you who have used hydrogen peroxide to treat stains on your cup: I have a mooncup that I've used for 4 years now and it has become stained. I've heard about treating stain with hydrogen peroxide so I bought a small 100 ml bottle (approx. 0,5 US cup) with 3% hydrogen peroxide. Now I'm just wondering if I could get away with diluting it more with water so the bottle lasts longer or what do you think the percentage needs to be to effectively treat the stain? 
Sarcasticia Nitpickersontisiphone on November 10th, 2014 10:49 pm (UTC)
I honestly wouldn't worry about making it last longer, as it will only last about six months opened anyway. That said, you're stain treating, not sterilizing, so you could dilute it to half strength, try it, and then increase the strength until it works.
liveinpompeiiliveinpompeii on November 10th, 2014 11:17 pm (UTC)
thanks for your answer :) I did not realize it only lasts 6 months when opened
lurkmaster10lurkmaster10 on November 10th, 2014 11:22 pm (UTC)
I always soak mine in a diluted mixture. It's roughly half water, and half hydrogen peroxide; works like a charm.

And my hydrogen peroxide seems to work fine well after six months. Weird.
Sarcasticia Nitpickersontisiphone on November 10th, 2014 11:25 pm (UTC)
It doesn't immediately stop working, but it gradually denatures. (It basically turns to water, it's unstable in the long term.) It depends on how you keep it, but the general guideline is after six months, you'll want a new bottle for any disinfection use, and it will be unpredictable after that.
rieq on November 11th, 2014 04:39 am (UTC)
Out of curiosity, is peroxide expensive in other countries or something?? Around here I can get a much bigger bottle for about $1 US. I didn't know that it could expire, thanks!
Sarcasticia Nitpickersontisiphone on November 11th, 2014 07:48 am (UTC)
Yes, basically. In the UK at least it's more expensive and sold in smaller bottles, and you have to get it from the chemist, it's not out on the shelves. I don't know why.
Kai: 2Cupskuradi8 on November 12th, 2014 03:12 am (UTC)
Ha. It's available in nearly every US store that sells simple first aid supplies. I just bought a quart (.9L) for less than a US-dollar today. I wonder why it's so expensive and so hard to get in other countries.