Predicta front screen

[ldj1002]

I just polished my front screen and it came out real good or so I thought until I laid it down on the counter with a white towel partly under it. The part of towel under screen wasn't nice and white like the part not under it. It was like the screen is tinted. I can pick the screen up and look through it and everything looks real good. Question is, is this screen tinted or is it perfectly clear?