All our products are carved from raw, real shungite stone. After manufacturing and processing, we thoroughly wash each product, but shungite dust may remain on its surface. It is shungite dust that gets your hands dirty. Rinse your product under running water and wipe with a dry, soft cloth to remove excess shungite dust. The black raw stones of shungite also get their hands dirty. Just rinse the stones under running water. Shungite is an absolutely safe mineral for animals, plants, and humans. Its dust is used as a mineral additive in agriculture and agro-industry and in many health centers in Russia.