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A black kitchen sink often appears spotless and tidy right after cleaning. However, if the water is hard, residual water stains and scale can form grayish-white marks on the surface. These marks stand out against a black background and are often a source of consumer complaints.

Water stains are one of the most common stains on kitchen sinks, especially in environments where water is frequently used. Water stains are usually more obvious on the surface of black sinks, especially when the water droplets evaporate and leave white marks.