with the skeletons i prepare at work, after we feed them to the beetles we soak them in ethanol (alcohol) and let it dry out. what it does is kill any remaining bacteria on the skull. If it looks clean and doesn't smell you should be alright, you might want to do a quick soak in alcohol or peroxide but not too long if yo udo peroxide, it could eventually damage the bone if left too long. looks good!

~mike