I'm just in the process of doing one, not quite 100% clean yet before a final degrease and peroxide.
It can be confusing as sometimes it is described as vol 20 (6%) vol 40 (12%) etc...TRADEME normally has a few examples although they seem pricey this year, I've normally got litre of developer for around $20 from memory.
Will have a look in a chemist but I think they will be more expensive.
Once your happy its clean and degreased put some protection around the base of the antlers, get a plastic tray that will fit the skull in and paint it on starting on the inside. Get into all the cavity. Put it somewhere warm, and leave it for 12-24 hours.
I normally do it before work then wash it off when I get home and let it dry fully before either settling with the result or giving it a bit more..I'm happy with taking a bit longer to get it right.
Good luck its rewarding and a good way of honouring your efforts on the hill and the animal.
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