... Crystal Shield and other maintenance agents: Compared ItemsMelt Wax (Resin)Crystallizing Agent (Power, Slurry, Liquid)Crystal ShieldScope of ... polished tiles), timberGranite, marble, sand stone (cautious for black stone)Granite, marble, sand stone, microcrystal stone, ceramic tiles, polished tiles and ... black, which permeates on the stone, forms iron rust or yellow spot, leads to stone bleaching.It’s a ...