It’s amazing how many times my mum comes out with something that I look up and it’s an old wives tale that has half the data right but exaggerates the consequences to an insane degree. The other day it was because she was moaning at my old man about puttin half full tins back in the fridge to finish the next day. She was convinced metal can oxidise and leech into the food, which is true, if you leave the can in there open for about a year, lol.