I think you said "best checked in the shade". You were right. Fired her up in the shed. Much easier to see.
On my Velo flat twin I have one pipe, colour as fitted and one a rich blue. A compression test gives identical figures. Both give a temperature of 305C after ticking over for five mins. The material for the pipes could have come from different batches I spose but I'm really not losing any sleep over it. Keeps it interestin.