I’m wondering if anyone has experience with different qualities of Grade A plywood. I purchased a sheet of 1/2" Birch plywood from Home Depot. As I cut into it (making some pockets) I’m finding numerous voids and “black” wood inside. This can also be seen on the edges. I also purchased a little piece of 9mm Birch Plywood at Michael’s. It seems to be much higher quality. No voids and less dark stuff. The Michael’s piece was more expensive per square foot, but then I was buying a small piece.
I was wondering what others’ experience has been? Does anyone recommend a source for high-quality plywood? Or an alternative?