Does the colour fade on the Black Progasm?

Not from my experience; I've removed the Aneros flag from the base, as well as the K-Tab (jabbed my tailbone too hard, not good sensations or movement but dropping on the floor), and the color goes all the way through.

as with @Badger , no. I have an old Black one from five years ago. It's been carved on, to a degree where it's about 1/2 way between a Pro Jr. and a stock Progasm in dimensions. Then, sanded and polished (with rubbing compound applied to a buffing wheel.

The manufacturer cautions against this sort of abuse (or 'enhancment') as they don't guarantee that the density of the material will be uniform as more plastic is removed. I've not found any such defects in my Aneros toys.

It started out Black and, in spite of a monthly bath in the dishwasher is still Black (except where it's covered with copper foil left over from a failed e-stim project).

More recently, I've acquired a Pro Jr. which has the Aneros "Ice" finish. It may be too soon to tell but I see no issues with that finish either.

Enjoy !