I have dual studio displays and I have noticed (when the screens are off) that the glass is coated with a different colour. One is green tinted and the other is purple tinted. I have looked at my old iMac and that had a purple tint to it also.
I have also found that when wiping the screens with a microfibre cloth the green tinted one grips the microfibre more, but it glides across the purple tinted one more easily.
I wouldn't even have noticed if it wasn't for the fact that I have 2 displays side by side.
Quality wise it makes no difference to the image and I can't even see it when the screens are on. Just an observation really.
I have also found that when wiping the screens with a microfibre cloth the green tinted one grips the microfibre more, but it glides across the purple tinted one more easily.
I wouldn't even have noticed if it wasn't for the fact that I have 2 displays side by side.
Quality wise it makes no difference to the image and I can't even see it when the screens are on. Just an observation really.