You might soak it in Acetone for awhile and get some of the yellowing out of it. You're right though,.....boiling is NOT the best way to remove the flesh from a skull. If you boil it too long the bone gets chalky and will flake off with you. Letting the bugs do it is better to me. Then soak it on Acetone to degrease it.
I have read that and have also read that white gas works well too. I have not tried either one. I think I will try one or both on the next one.
Here is the latest one I finished

I did not boil this one near as hot.. Just brought it to a boil then turned the fire down and put a lid on it and let it simmer for about three hours with half a bottle of Dawn in the water. It turned out a lot whiter
This is the stuff I'm using to whiten after the cleaning process. Got it at Sally's Beauty Supply

This is the head I am working on now. I cleaned this one with the cold water maceration method... Meaning I submerged it in a bucket of water and let mother nature take care of it... Now let me tell ya, this head has been in that bucket since February and when it came time to empty it and clean it up.. HOLY CRAP its the most rotten thing you will ever smell.. I have a terrible stomach so I put on a respirator but it didn't work on keeping the smell completely out so I dry heaved a few times. LOL.
This is the way it came out after washing it off so I am going to just try and start with the whitening process. I just paint that crap on and seal it in a plastic bag and let it sit in the sun for a few days..


If anybody has any tips and tricks that would make this easier please enlighten me because this stuff is a lot of work..