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Noun. 1. tan-a browning of the skin resulting from exposure to the rays of the sun. sunburn, suntan, burn. hyperpigmentation-unusual darkening of the skin.
Water with this type of iron is usually yellow or brown, but may be colorless. As natural organics produced by vegetation, tannins can stain water a tea color. In coffee or tea, tannins produce a brown color and react with iron to form a black residue.