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No correct guesses yet... none even close 
Hint: One of these layers is boron coated!
Definitely getting warmer!
Hint: It is not a "counter"
Wolf480pl @wolf480pl@mstdn.io
@gigabecquerel a model of black body?
@wolf480pl @gigabecquerel but it's not black!
@f4grx @gigabecquerel
The gaps between the plates look black to me.