Is the aluminium foil usable in this condition?
As the title says, is the aluminium foil still usable in this condition?
If you notice, there's a very obvious white portion in the center of the aluminum foil and the entire roll is like that. Usually when I buy it from the store, it is pure silver without the white line. However when I keep it for some time, this white line appears which appears to me that the foil could be "spoilt"?
May I also ask what is the name of the condition of this aluminum foil and what causes it to be like this.
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That's just aluminium oxide (Al2O3) and it's harmless as:
it's insoluble in water
it's nearly insoluble in alcohol.
is very hard (Basically the same material as a ruby or a sapphire)
it's chemically nearly inert
Is basically the same substance as the non-shiny side of the Aluminium foil
So it's definitely useable for all intents and purposes. (including cooking ;-) )
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