Im glad you asked. I do a lot of euro mounts. This is ho I deal with it.
So your cleaning that deer skull for a Euro mount and you get sloppy and get the oxi clean or bleach or peroxide or whatever you use on the antlers by mistake and bleach the antler as well. Now what? I have found that stains and dyes just don't cut it with antlers and the color match is never quite right. A long time ago I had heard about a common hardware store item working well to re-color antlers. I had some of this on hand for Boy Scout uses as an antiseptic, water purifier and fire starter (when mixed with anti-freeze or soap or sugar water, etc). Way back in the day it was part of a boy scout first aid kit until it was discovered that if accidentally mixed with the glycerin soap in the first aid kit that it would start on fire (just like mixing it with anti freeze) The product is called Potassium Permanganate. Its used today by those with a green sand water filters as an oxidizer.
To show how its applied, I took a section of antler left over from a project and boiled it in a mixture of water, oxi clean and bleach.
** Important safety note****
Don't boil water and oxi clean and add bleach unless you want a huge mess with lots of foaming. After cleaning that up, I mixed a smaller batch. Anyway. Here is the antler section.
Then I left it in the cleaner for a few hours to bleach it.
The bleached antler.