It's a function of both the way I machine it and the color of the plastic.
And unfortunately I don't have Brian's hack on my Empeg so I can't test it out either.

The Neon colors are very bright plastic. When you look at them face on they don't even look like the color they are. The Neon Red looks pink and the Neon Green looks yellow/green. The Neon Orange is the only one so far that looks like the color it is.