Demi-John

(c) 2000
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TANNINS
These are present in grapes and are responsible for flavouring - especially red wines. Extra tannin is often needed in non-grape wines (wine tannin or grape tannin).

trial jarTARTARIC ACID
The main acid present in ripe grapes. It plays a vital part in the maturing of wines.

TRIAL JAR
An upright container made from glass or clear plastic for holding a  small quantity of wine. A hydrometer is floated to check the specific gravity.