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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.
Tannic acid is a basic ingredient in the chemical staining of wood. The tannic acid or tannin is already present in woods like oak, walnut, and mahogany. Tannic acid can be applied to woods low in tannin so chemical stains that require tannin content will react.