(finding the body in the barrel)
Catherine: Soap mummy.
Grissom: Adipocere, a.k.a. Mortuary wax. This is what you get when fatty tissue decomposes in an alkaline environment with limited oxygen.
Catherine: All you need is a little moisture and enough time. Anaerobic bacteria digest body fats, converting them into a waxy solid. Kind of like the way they make vegetable shortening.
Brass: I'll never eat another french fry again.