When Concorde was in service it had very strict livery restrictions due to the heating effects it experienced in supersonic flight. Normally it would be painted in a specially developed highly reflective white paint, approximately twice as reflective as normal white paint. When one Concorde was painted blue for a Pepsi promotion it had its Mach 2 operation limited to around 20 minutes at a time. However when the SR-71 was in service it would fly much faster but was painted in a special stealth radar absorbing matt black paint. Is this just a function of one being aluminium and one being titanium and able withstand higher temperature, or that with surface protection sophisticated enough either colour can be made to work?
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