The Second paints their machines in gold with black highlights.
Per FM:Periphery, page 37.
The insignia of the Canopian Fusiliers is three gold diamonds above a bloodstained saber. The Second’s insignia was designed to show their hatred for the Star League and the Hegemony which spawned it: a golden sun circled by nine planets, the third of which is colored vividly in blue and green, being swallowed by a black hole. Per FM:Periphery, pages 26 and 37.