As promised, here are a few pics of Astrophysical Purple
And Enigma Gray
Here compared with Enigma Black at left:
Note that each enigma color is itself only one color, no differently colored specks or flecks. Anything that looks like light flecks is just how the light plays off the texturally raised areas.
I tried to show the enigma grays at different exposure/lighting levels so you can see that in some cases it can look really dark, almost black, and in others more like a dark-to-medium gray.