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Don't try this at home. I used 60g of lye to 500ml cold water, it was a bit strong.
Sodium hydroxide is super dangerous, it'll dissolve aluminium, metal, and your skin.
Coca cola cans are sprayed with a plastic coating liner inside to keep the coke etching the aluminium away. After sanding off the label, I added 60g of lye to water (don't do it the other way around), stirred, then poured this into a suitable vessel around the can. After about 20 minutes, all the aluminium dissolves, leaving a weird bag of coca cola. Watch out for air bubbles caught under the bottom of the can too.