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...d rates of erosion. Most common monument colors for granite are gray, then black, then mahogany; for marble it is white. Today, the majority of the stone us ...one cleaning either in development or already in use, such as removing the black gypsum crusts that form on marble and limestone by applying sulfate-reducin

...es, it also was used for buildings. The traditional turf-roofed Highland [[Black house]] was constructed using the double wall dry stone method. When buildi [[es:Piedra seca]]

...pule]]s, [[Vesicle (dermatology)|vesicle]]s), and color (red, blue, brown, black, white, yellow).<ref name="FitzAtlas">{{cite book |author=Fitzpatrick, Thom ...pg|thumb|upright|[[Black hairy tongue]]|alt=Adult tongue with a strikingly black top]]