The coloration is highly variable depending on how you look at it. Just like oil on water. If the light hits it right you see the rainbows, look at another angle and it just looks like water.
I dunno about car shows, seems like most of the people I sell to really drive the cars. . I just build them to run really well, making them pretty is a handy bonus, and obviously doesn’t hurt selling them.
I’ll take some out in the sunlight to take pics sometime. These are all taken in my shop with fluorescents that are heavy in the blue spectrum (which I prefer for a work space)