Did you cook the purpleheart at all,,just wondering,, cooking it will draw the oils out of the wood and keeps the color,, it will turn blackish on the outside and when you cut it will be more purple inside,, of course not all purpleheart is created equal,,SOME will do this, cook at 200-250° for about 30 to 45 min watch closely and turn it at least once,this works with the stock i have, with yours cooking times may vary. Try it first on scrap. Good luck.