I making another end grain cutting board. I'll be using Maple, Walnut, and Purpleheart. The end grain of the Purpleheart looks a lot like the end grain of the Walnut, right after it is cut. But the same happens when I plain the Purpleheart. Then it slowly goes back to looking purple. Has any one else experienced this? I hope I'm not crazy. I also hope that the end grain turns purple.