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... too thick and a bit narrow.
Many drinks cans are made from aluminium - including beer cans- so there could be a wide choice of can for homemade aluminium labels
I get my black ones here:http://www.wellsandwinter.co.uk/plant-labels.htm
For ecological reasons I never buy any drink in cans or in one-way (plastic) bottles. But at the office I tested a few cans of cola with a magnet, and the magnet told me they contain iron. So, even if I use beer cans I still must ask to the colleagues to drink for me I'm sure they will be happy to help me out.