Baker Norbert Zielinsky Jr. refused to have toxic cleaning products in his bakery. After much experimentation with natural raw materials, the Universal Stone was created in 1984. This natural fine polishing clay gets rid of the stubborn stains from sensitive surfaces without leaving scratches. ZIELINSKY is a small family owned company in Germany. All ingredients are toxic free, biodegradable, phosphate-free and skin friendly. The Universal Stone has an unlimited shelf life and one jar will last a family for years.