Here's a shot of a real sapphire blue NEGMCO beehive next to an altered sapphire blue POSTAL beehive. Hopefully you can see the dark, smokey difference between these two. I have 4 irradiated insulators in my collection although I don't particularly seek them out.

How many have noticed that the sapphire blue POSTAL listing jumped from $10-15 in the 1999 guide to $125-150 in the latest version?