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Foil is a standard name for well transparent foil.

https://en.m.wikipedia.org/wiki/Transparency_(projection)



Lol that still doesn’t explain it - they’re called foils because their name is foils? That’s tautological!


It's from French feuille, for 'leaf', so it's used for all these thin film things that are leaf-thin.


Demanded an answer to his question and didn't even say thank you.




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