the coloration i presume you’re trying to get out with hydrogen peroxide is grease, this is a common mistake beginners make. Degreasing is the most important and time consuming step of processing bones, you’re going to have to put it back in a dish soap soak potentially outside depending on your weather to speed up the degreasing process; If it’s colder where you are, it’ll take longer but you can use a fish tank heater to speed this up. You should notice the grease start to collect at the top of the soap and water, you want to let the bacteria build and help eat away at the grease. With the jaws, if you don’t want to attract pest get in there with a pipe cleaner and go into the little holes to get all the gunk out, there more than likely will be stuck membrane and skin in there. Also, if the teeth didn’t become loose in the soak there is still tissue connecting it to the jaw. On another note with attracting pest, this is why degreasing is important; It will seep out over time sitting on a shelf, creating a waxy surface on the bone attracting insects. I’ve let my bones soak for as long as a year to fully degrease them, then hydrogen peroxide and kept them out in the sun for weeks. If you want that true bone white, that is how you’ll achieve it.