just thought I would add a few emissivity values that might be of interest all at 300K
Polished copper:0.03
Polished aluminium:0.03
anodised aluminium:0.84
Black paint (parsons):0.98
white acrylic paint:0.90
white zinz oxide paint:0.93
so you see colour isn't really all that important. maybe the best solution would be to dip it in an anodising bath
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