strange moiré pattern on copper pot after making stew

69
12
Joined Apr 6, 2010
hi - newbie here

made a wonderful lamb stew tonight in a brand-new baumalu tin-lined copper pot (probably  5-qt or so size). after removing the leftovers and portioning it into containers, i noticed a grey discoloration in the pot. i know that tin goes grey after a while, so i didn't really think anything of it. but upon further inspection, i noticed that the discoloration consisted of a distinct moiré pattern. i took a couple of quick snaps with my phone:



 
138
11
Joined Feb 4, 2010
Very strange. Is it not an optical illusion as a surface feature? After all, Moire pattern is an optical phenomenon.
 
69
12
Joined Apr 6, 2010
 no (and, yes, i understand that a moiré pattern is an optical illusion) this is definitely a physical phenomenon. the only thing i can think of is that something acidic in the stew reacted with the tin to score it somehow. as to the pattern - i have no idea!
 

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