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But I suspect what was actually needed was sodium *PER*carbonate! 😫
https://en.wikipedia.org/wiki/Sodium_percarbonate

Wikipedia confirms that, in water, percarbonate decomposes into hydrogen peroxide. Which is why it works the same for #retrobrighting.

But I don't have any percarbonate at home, and it won't arrive before Dec 29 either.

Moreover, how much would I need to get the equivalent of 12% peroxide? Now I regret not paying enough attention in #chemistry classes! ⚗️