hard anodized cookware coating worn off or just discolored?

25
11
Joined Jul 27, 2010
I'm gradually supplying my kitchen with old Calphalon commercial hard anodized aluminum. Sometimes I see a piece with a light grey bottom, like this:


For something like that, is the coating is worn off, or just discolored? Would it still be good for acidic foods?
 
25
11
Joined Jul 27, 2010
Cool, thanks. I've also seen pans with this light grey most of the way up the sides, until a certain level, above which the pan is dark grey as if new. Any theories as to what might cause this?
 

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