Quote Originally Posted by paul ron
Last night I was making some prints and noticed faint white grid on my prints. It seems the light is passing thru my paper and reflecting back up thereby fogging my pics but I have never realized or noticed this before..

I've had this very same problem many years ago. I immediately painted my easel flat black, and exposure times increased !

And yes, this paper backlighting makes for less sharp prints, because the reflected light is more diffuse than the direct enlarger light. Even if the difference was small, I could see it. (I still had young eyes back then.) It's another factor to eliminate if you want to produce topnotch prints.