Yeah, I’m aware that you can get freezers that can go to below -20°C but a.) you’re wasting energy doing so (-15°C is far cold enough to keep everything safely frozen) and b.) lots of older freezers don’t go that low, and a lot of people still have and use them. And also, actually having paper in -20°C mightn’t be enough to cool the ink to that temperature (unless you leave it for a long time), so simply stating that putting your erased text in a freezer isn’t really the best advice unless you actually know how low you can go, which is, as far as I know, at a bare minimum -20°C. Someone else posted about using a freezing spray, which I’ve never even heard of before, so this would be better advice 
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