User blog comment:PullingoffMasks/How to do your fucking research/@comment-9340689-20140127014502/@comment-9340689-20140127190017

Mummys that rot are considered poorly mummified....many mummified corpses look exactly as they were when living (albeit dehydrated)

I used to correct my social studies teacher about ancient Egypt (and she would realize I was correct, and brought it up at a parent teacher conference because she thought it was funny) I know a lot about ancient Egypt. If a corpse that is suppossed to be mummified is rotting, something went wrong during the process.

The later trotting would probably happen as a result of the mummified corpses being exposed to moisture, and thus are no longer dehydrated (Ossmosis perhaps?)

If a mummy becomes moist again, it is possible for it to start rotting.