I have no idea. LOL! I typically use aluminum foil for an Esbit/Canteen/Alcohol/Hobo stove base/ash plate, windscreen and also for pot/canteen cup lids. I find beer/soda cans much more durable so have mostly switched over. I give everything a good burn-in before using with water or food, but it's probably killing me just like everything else.

I have been known to use soup cans for pots, though, and also do a good burn-in with those. The ones with a white lining are pretty easy to see.

EDITED to correct terrible keyboarding habits that chop sentences in half and scramble them up.