Whats this weird rainbow stuff on NGC slab?

None of those. It just indicates some mechanical stress. Sealing a slab with no stress on the plastic would be ideal, but in a real world process, minor stress will occur. yours is minor since it is difficult to see. If it was stress enough to crack the plastic, it would be vivid. If you can find a thin piece of plexiglass or similar, take it out in the sun light and twist it. When the stress gets extreme , the plastic will crack. Yours won't.

 

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Make sure you get your toned cases encased ;-)

On the serious side, I believe desertgem is correct.
Furthermore if you hold that case so that you can see the rainbow, then twist it, the rainbow should move around.
And you don't need to twist it hard since you're dealing with distances down around the wavelength of light (400-700 nanometers).

 

+1
That was great!

 

I have seen stressed plastic diffraction before and I don't believe that is what is causing it. These "rainbows" tend to be where the insert touches the outer shell plastic and I believe what you are seeing is an interference diffraction pattern caused by traces of moldslip remaining on the plastic. (Moldslip is a oil the injection molds are coated with to keep the plastic from sticking to the molds during the fabrication process.)

 

Another good possibility.
Like oil on water.

 

Wear some "polarized" sunglasses while viewing this particular slab, the rainbows will disappear and you'll look cool at the same time.

Happy Collecting

 

LOL! Hunt better paint some shades on that Smiley face... or steal them from Doug when he's asleep.

 

Isn't that due to aging of tho case!

 

Ahhh dont paint on ardy!!!!!!!!!!!!!!!!

 

Hey whats this weird rainbow stuff on Ardy?



LOL!

 

ARDYS TONIN G@@@@@@@@@@@@@ i would use that as my avatar but people might thing im not straight lol

 

Put in on ebay as a rainbow toned slab! $10,000

:too-funny: