I think that gold you see is a gouge only partway through the candy, so that the color is not as deep. I have seen several severely faded flake sunrise orange tanks where the orange is almost totally gone exposing clearly silver flake.
It seems every 6 months at least, someone starts a thread about how one or more of these amazing colors was created. Someone usually comes up with the chart that lists the exact ingredients for each color, which unfortunately, is largely useless as the company is no longer in business, and the codes are obsolete. Also, the specific application of candy paints depends on the technique of the painter and probably had a surprising amount of variation straight from the factory.