We were shopping a Stern Austin Powers a few weeks ago and noticed the translite seemed a little opaque at the black ink. We took it apart and found some of the ink from the translite had outgassed onto the glass, creating this ghosting effect.

The ghost in the machine!

Luckily, we had another Austin Powers at the time and could compare the two!

A careful cleaning and the ghosts were gone. Makes for some interesting photos though!