To confirm, the thermal conductivities of Aluminium Copper and Brass are as follows. (all at 273K)
Aluminium 236 W/m/K
Copper 403 W/m/K
Cu-30wt%Zn (Brass) 106 W/m/K
So, there it is. Copper is roughly twice as thermally conductive as Al, which is twice Brass.
Also, I think the Al lid to the TC-4 is anodised black, although I may be wrong.
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