Question for experienced coin graders

I can't find a hint of color in the NGC photos. Now I'm wondering if the seller actually uses gel filters, or maybe multiple lights with different color temperatures, to get that pastel-rainbow effect...

 

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From what I recall a lot of their coins have this same look. Some of their feedback call them out on it if I remember correctly, but it's been a while since I looked at this seller.

 

If I ever clear off enough space to take up coin photography again, I'll want to give the different-color-temperature thing a try. I think I actually had some issues avoiding it in the past, where my subject lights didn't match the ambient color temperature.

 

Yes, that is some crackerjack sleuthing by ddddd. I learned a lot in this thread, thanks all.