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Leon,
Hydrogen peroxide will attack organic matter including you. The 3% is pretty mild but I think 15% will bite. I've only ever mixed down from 30% and it certainly is dangerous - especially to eyes. I don't know what safety instructions the manufacturer suggests but I'd go for waterproof gloves and eye protection as a minimum. If you have a full face mask I'd use that too. Also long sleeves, long trousers and closed shoes. In the lab we also had an eye-wash station and emergency shower within a few steps, so perhaps have a hose ready in case you need to rinse it off something.
FWIW hydrogen peroxide decomposes over time, leaving just water. If you don't use it immediately store it in the dark in a cool place. In a fridge is best but not in a domestic fridge with food!
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