... of quartz crystals, and mixed with high-strength resins and other additives.It is no absorbency and a non ... easy to clean.It would not leave any mark after contacting with acid,alkali.Just rinse it with water every time ... vacuum compressing, pulsing vibration, polymerization, solidification and polishing with the professional equipments.Place of OriginChinaMaterialQuartz stoneColorblack,white,yellow, ...