... Stain resistance and Self-cleaning Green Sandstone Wallboard Mega green sandstone wallboard is made of inorganic mortar ... as kitchen,bathroom,restroom,changing room,etc. Australian Sandstone VS Mega SandstoneFeatureAustralian SandstoneMega SandstoneTexture and ColorNatural color ... color and texture, small color variation of the Sandstone from different boards, installation effect is uniformedStain ...