I had already taken rhe plastic off before turning the light on and noticed two very small dark spots that turned out to be between the layers of fabric. Only noticeable when light shines through.
Because it will be on a bedside lamp and can have that side face the wall I will keep it. 
It is a little pricy for the fabric finish as well. It wasn't as textured as as most linen can be so I was a little disappointed. 
Needing a rectangular shade gave me little choice as I had searched for one for awhile.