Check out aqua silk. It’s a pool cleaning chemical made up of a high percentage hydrogen peroxide mixture. I’ve done my deer and recently my elk using this chemical. If you YouTube “white bone creations” he has a cool channel and does a good tutorial that echoes what many on here have stated. If I can give you 1 lesson learned it is this: spend the time to protect the natural color of your antlers before you go boiling everything carelessly with the expectation of recoloring with coffee grounds or other means... you’ll be glad you did- trust me.