mercaptans : A class of unpleasant smelling chemical substances containing sulfur. They have aromas of cabbage, dirty socks, rubber and the like, and when found in wine are considered a major fault.
Mercaptans: An unpleasant, rubbery smell of old sulfur; encountered mainly in very old white wines.
mercaptans, wine fault popular with Australian tasters. A skunky smell results from yeast reacting with the lees. It can be cured by assiduous racking.
Mercaptans - Foul-smelling compound derived from a problem with hydrogen sulphide, which gives a smell of onions, garlic, burnt rubber or stale cabbage.
Metallic - An almost bitter, tinny or inky, hard finishing flavour of metals in reds.
MERCAPTANS
An unpleasant, rubbery smell of sulfur. This is mainly encountered in very old white wines.
[edit] Mercaptans
ethyl mercaptan
Mercaptans (thiols) are produced in wine by the reaction of hydrogen sulfide with other wine components such as ethanol or sulfur containing amino acids, such as methionine.
mercaptans...
Can be formed when alcohol reacts with hydrogen sulphide - the "rubbery", "old sulphur" or "bad eggs" smells encountered in over-reduced (very de-oxygenated) wines or very old white wines that are past their best.
H2S and/or mercaptan
After Yair Margalit: Winery Technology & Operations.
Skunky: A severe off-odor caused by mercaptan formation. See Hydrogen Sulfide. Small Mead: See Mead SO2: Sulfur Dioxide. See Sulfite. Social Wine: A wine that is sweet but not dessert sweet, with a specific gravity in the range of 1.014 to 1.
These compounds can be considered "volatile" like aldehydes, ethyl acetate, ester, fatty acids, fusel oils, hydrogen sulfide, ketones and mercaptans) or "non-volatile" like glycerol, acetic acid, and succinic acid.
Descriptive term used when comparing odor detected in the "nose" of a wine with similar odor retained in a memory trained by the use of a comparison kit of scent essences. Such kits include tar, mercaptan, apricots, ...
TARRY/TARLIKE Descriptive term used when comparing odour detected in the "nose" of a wine with similar odour retained in a memory trained by the use of a comparison kit of scent essences. Such kits include tar, mercaptan, apricots, ...
Mercaptan form of alcohol in which oxygen is replaced by sulfur. Has a strong and disagreeable taste and smell. Meritage an American word created in 1988 from "merit" and "heritage" to mean "Bordeaux-style blend.
mercaptansWine spoilage caused by overuse of sulfur. The resulting wine smells of garlic. mesoclimateThis term describes the climate of a small area, typically an individual vineyard or hillside.
 See also: Fermentation, Grape, Bottle, Wine, Yeast
  
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