[30] Pumice in powdered sort was an ingredient in toothpastes in historical Rome.[31] Nail care was extremely important in historic China; nails were being held groomed with pumice stones, and pumice stones were being also employed to get rid of calluses. Porosity: Pumice is extremely porous, with up to ninety% https://socialbookmarkgs.com/story19463625/an-unbiased-view-of-pumice-stone