Is the wood stabilized? If not a trick we do when finishing burl is as follows:
Fine sand to at least 500 grit. Blow off all dust with air compressor.
Using danish oil, preferably satin finish apply a very liberal coat. Let it soak in about an hour and wipe off thoroughly with an old t shirt. Then let it dry till feels dry to touch. Rub down the handle with extrafine steel wool then blow off again. Apply another coat of oil, let it sit an hour and wipe again. Repeat this 4 or more times till you like how it looks. Most people make the mistake of not applying enough coats and end up with a dull looking handle. After it dries a couple days you can spray with lacquer or wax and buff. It might sound like a lot but it will give more depth to any figure and make the colors more vibrant.
I hope this helps. Mark