Astringent

An astringent (occasional alternative: adstringent) substance is a chemical compound that tends to shrink or constrict body tissues. The word "astringent" derives from Latin adstringere, meaning "to bind fast". Two common examples are calamine lotion and witch hazel. Another example would be Yerba Mansa, a native plant of California.

Astringency is also the dry, puckering mouthfeel caused by tannins found in many fruits such as blackthorn (sloe berries), Aronia chokeberry, chokecherry, bird cherry, quince and persimmon fruits, and banana skins. The tannins (which are types of polyphenols) bind the salivary proteins, causing them to precipitate or aggregate and lead to a rough "sandpapery" or dry sensation in the mouth. Tannins are found in some red wines and teas. A small amount of astringency is expected in some wines, especially young red wines made from grapes such as cabernet sauvignon and merlot.

Uses

Astringents in medicine cause shrinkage of mucous membranes or exposed tissues and are often used internally to check discharge of blood serum or mucous secretions. This can happen with a sore throat, hemorrhages, diarrhea, or with peptic ulcers. Externally applied astringents, which cause mild coagulation of skin proteins, dry, harden, and protect the skin. People with acne are often advised to use astringents if they have oily skin. Mild astringent solutions are used in the relief of such minor skin irritations as those resulting from superficial cuts, allergies, insect bites, or fungal infections such as athlete's foot.

Wine tasting descriptors

The use of wine tasting descriptors allows the taster to qualitatively relate the aromas and flavors that the taster experiences and can be used in assessing the overall quality of wine. Wine writers, like Karen MacNeil author of The Wine Bible, differentiate wine tasters from casual enthusiasts; tasters attempt to give an objective description of the wine's taste (often taking a systematic approach to tasting), casual enthusiasts appreciate wine but pause their examination sooner than tasters. The primary source of a person's ability to taste wine is derived from his or her olfactory senses. A taster's own personal experiences play a significant role in conceptualizing what he or she is tasting and attaching a description to that perception. The individual nature of tasting means that descriptors may be perceived differently among various tasters.

The following is an incomplete list of wine tasting descriptors and a common meaning of the terms. These terms and usage are from Karen MacNeil's 2001 edition of The Wine Bible unless otherwise noted.