... honed, flamed,polish,chiseled BLUE LIMESTONE BATHTUB The blue limestone is the most pupular color in Europe Market. And our prroducts ... quality.and we have become the largest blue limestone manufacturer in China .It is nontoxic, green environmental protective, the stone ... sink, gutter, pillar, mushroom, and carving 4) Usage: widely used in building's construction and decoration blue limestone bathtub