Mold — Mold is the dense, matte color of freshly crushed charcoal or aged, heavy iron. This color belongs to the Black, Gray, Green, and Brown families. Its very low, nearly equal RGB values, with a subtle green dominance, create an ultra-dark, neutral charcoal tint. also commonly known as Deep Charcoal. Nearest neighbors are Black, DarkSlateGray, and DimGray.