Hello. I acquired a crab fossil (Harpactocarcinus punctulatus, Eocene, Italy). The fossil still has a whitish matrix patina that covers the back of the exoskeleton (and other parts). I think it's possible to carry out further preparation of the fossil to highlight the structures of the back - I have no experience in this regard but I am curious to know if it is possible (and/or advisable) to prepare the fossil with simple mechanical (or chemical) methods, since I don't have a sand blaster system. I attach 3 images of the fossil. Thanks in advance, Fabio