Black tongue fur

A tongue fur presenting a blackish or grayish coloration. Black fur may occur in cold, heat, repletion, and vacuity patterns, but most commonly indicates exuberant evil. A rough dry black fur somewhat parched in appearance, on a red or crimson tongue body indicates damp-heat transforming into dryness or damage to yīn by intense heat. A thick slimy black fur usually indicates a phlegm-damp complication. A glossy black fur signifies either stomach or kidney vacuity. A slimy yellow fur with a grayish black coloring generally indicates exuberant damp-heat. A mixed gray and white fur or a gray fur that is thin, slimy, and glossy generally means cold-damp.