I personally have changed where I was going to index points in a forearm to show the mineral spots and natural defects. I once had a birdseye forearm that I had planned to put ebony points into. While turning it down a streak showed up like yours and just kept getting bigger with every turning. The streak ended up about 4" long and I just left it like that to show it off. No points or anything. I think that kind of stuff reminds people it is still just wood. Like someone said earlier the defects show it is hand made and gives it character. I love the look of that stuff.