I recently decided to build my first rifle using a pre-inletted stock for a Vincent Ohio rifle. I purchased a fancy maple stock, and it has a couple of dark lines on both sides of the butt section. They are about 1/32" and are about three inches long. My guess is that they are inclusions of some sort. They really stand out in the unfinished stock. Will these lines show up when the stock is finished? Can they be sanded out? Any advice? Obviously, I'm new at this, but am looking forward to the project.