Why was the Concorde painted white and not black? It's well-known that the stated reason the Concorde was painted predominantly white was to mitigate heating problems.

However, given that the source of the Concorde's thermal woes wasn't excessive exposure to solar radiation, but, rather, direct conduction and convection of compression heat, I'm confused; in that case, shouldn't the Concorde have been painted black (or nearly black), like the SR-71, to better radiate heat away?
There is a discussion on it here that's worth reading but in short the requirements were just different. A few of the key points, 


The black color on the SR-71 offered some night camouflage in addition to its heat dissipation
The Concorde had an Aluminium airframe while the SR-71 had a primarily titanium airframe which could lead to different coating types.
The Concorde was a commercial aircraft many of which are often painted white thermal benefits aside they may have simply been keeping with what they usually did. 
The SR-71 flew substantially faster than the Concorde and had different thermal requirements. 
The hottest point on the Concorde was the nose 127&deg;C which was actually cooled by fuel being pumped through as a coolant. The hottest point on the SR-71 was the cockpit window which cooked in at 327&deg;C again, very different requirements thermally.