My only bone project currently is a domestic cat skull I'm doing for a friend, so I'm seeing how far I can degrease it without pulling out the heaters. However, the inside of the 3-gallon bucket it's in is getting coated with rough substance that's white and powdery when scraped off, and I'm worried that it's a calcium compound and derived from the bone. The skull also has a thin, powdery coating. It's been degreasing for two or three months, but still has grease in the zygomatic and occipital regions. I macerated the skull, and for degreasing I'm only using dawn and plain ammonia, although it spent a week in acetone at one point. I've also noticed that with just dawn or just ammonia, the water stays clear. But with a combination of dawn and ammonia, the water will become cloudy over 24 hours. I assumed that this was grease in suspension, despite this being at room temperature, but now I'm worried that it's bone material. Any thoughts on whether this is just adipocere, some contaminant, damaged bone, etc?