Complicated mixtures of organic substances with glass-like or solid-liquid properties. Resins that remain liquid after they come out are called balsam, hot hard resins (resins in the narrower sense) that harden in the air through the release of substances. The mostly intense and pleasant balsamic smell is caused by numerous essential oils, for example terpenes. Various resins, such as myrrh, were therefore already used in ancient times to flavour wine and other beverages. Probably the best-known resin-flavoured wine is the Greek retsina. Resin from the mastic tree is added to the Greek liquor ouzo. The Greek historian Herodotus (482-425 BC) reported that the Greeks chewed the dried resinous liquid that dripped from the bark of the mastic tree (as chewing gum, so to speak).
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