Nancy, I'm not sure what all you may be asking about, but I've had several years experience working with dermestid colonies. You asked specifically about killing bugs or ways to keep them out of finished material. I have successfully used a system of small paint brushes to remove asmany bugs as possible, followed by immersion in sodium hydroxide. This is the standard de-greaser and works quite well to kill instars that may be in areas of the skeleton that you cannot reach. If you have other specific questions, don't hesitate to email me directly. Carol K. Malcolm Texas Natural History Collection [log in to unmask]