When I sent this one off to be irradiated for my CREB 136 B&O study/article, it came back a vivid olive green. Very frightening as there is an olive green listing for these in the guide! I informed Dwayne and have posted a picture years ago. Well, over time (no heat reversal) this piece has lightened up and settled in on a gray green. I'm sure if I put it out in the Texas sun it would eventually revert back to aqua (perhaps). I hope one day to do a display of CREB 136 B&Os which will include this one as a "buyer beware" warning for educational purposes.