Don't forget back in the early days of motorsports car paint colors were used to designate country of origin.
White was Germany. Although later Porsche, Mercedes (Silver Arrows of the 1930s) and Auto Union (Audi) all went to silver (bare metal.) Blue was France, yellow was Belgium, and green was the UK ('British racing green.') Italy used red and so did the USA (although later it was blue and white.)
The FIA stopped using color designations decades ago, but some manufacturers still use them just as a tradition (Mercedes Silver, Ferrari Red, etc..) With motorsports outside of F1 racing, teams still pretty much adhere to the original color/country designations.
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