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Term for the "atypical age tone" in wine, emphasizing the distinction from the "true age tone". There are numerous synonyms such as acacia tone, floor wax tone, hybrid tone, candle wax, Mediterranean note, furniture polish, naphtalone, wet cardboard (papier mâché), wet cloth, dirty cloth, mothball tone, moth powder tone, soap tone (soapy), nitrogen builder, dull, detergent tone and washing powder tone. Aminoacetophenone (AAP) was identified as the responsible aroma component in 1993. The plant hormone indoleacetic acid is likely to be a major source. It is a natural wine substance which only causes negative sensory changes at higher concentrations. The perception threshold is 0.5 µg/l (microgram = millionth of a gram), values between 0.5 and 1.5 µg/l are considered to be mild UTA. In aqueous solution, the substance causes a floral aroma of acacia and oranges; only when combined with other aroma substances, the typical UTA tone develops. Together with other substances, AAP is the cause of the Fox tone of certain American vines, especially Vitis labrusca. This is why UTA wines often have this typical "fox taste".

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