About a week ago, ran up to HD and picked up a piece of 1/4" oak ply for cabinet backs. Got home, pulled the sheet far enough out of the van to slice off what I needed, and carried the piece into the shop. Trimmed it to size on the TS, and then turned it over. I was stunned to see that the veneer on the back was Black Walnut. It had some nasty black streaks in it, but it was walnut for sure. I checked the remainder of the panel, and it had some open knots, and more black streaks, but about 3' long, 4' wide is beautiful, clear, sliced veneer. The last time I bought a sheet of walnut ply it was $75. Needless to say I set that aside, and ran back to HD for more. All the rest had the typical oak or birch seconds on the back :(
Now I need to conjure up a project that needs a walnut back. Paul.