Hi @denise-porcello – interesting question. I am not familiar with coprolite re-hydration, but apparently it is a technique used widely in archaeology for analysis of ancient human paleofeces. The method was also used in analysis of coprolite from an extinct New Zealand moa, as described in this PLOS One paper: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0040025. I also know that a de-mineralization technique (perhaps this is more akin to what Mary Anning was doing?) was used by Dr. Mary Higby Schweitzer at NC State to enable study of soft tissues preserved in a T. rex femur. See more here: http://science.sciencemag.org/content/307/5717/1952