preserving a black cherry burl

..... or you could send it to me for safe disposal.

Depending on how long a "bit" is, it might already be dry and ready for final turning without the need for coating with Anchorseal. If there is fungus there might be soft spots in the burl which would need to be fixed. My two favorite ways to fix punky spots are thin CA and Minwax Wood Hardener. There is also the potential hazard of the piece flying apart so examine frequently and listen for "funny" sounds ... and, of course, stay out of the line of fire.