The phrase can be utilized synonymously with "volcanic ash." It is actually mined from volcanic ash deposits, or it may be produced by crushing rock pumice. Rub the pumice stone in round motions above the calloused place. Use Mild, circular motions to slough away the dead pores and skin like https://edenproductsltd.co.uk/2025/04/17/the-history-of-pumice-stone-from-ancient-civilisations-to-modern-day-uses/