Most pumice erupts from magmas which can be very charged with gas and have a rhyolitic composition. Rarely, pumice can erupt from gasoline-billed magmas of basaltic or andesitic composition. As you’ve soaked the skin so It can be great and delicate, the dry, lifeless cells really should occur suitable off. https://edenproductsltd.co.uk/2025/04/17/the-history-of-pumice-stone-from-ancient-civilisations-to-modern-day-uses/