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Sitting on two Royal FP Standard models that I want to repaint, I started looking at the six original colours that these Royals were available in. Then I found this spec sheet from June 1968 that lists Royal's official colour descriptions, not only for the FP, but several other popular Royal models as well.
The names of the colours make an entertaining read and will provide me with some ideas. I'm even thinking about changing the original colour of a Royalite that I have based on this list.
An ad showing the FP painted in "Sea Blue Smooth". Both of mine are finished in the more stodgy "Pearl Light Grey".