valonia

/vuh-loh-nee-uh/US // vəˈloʊ ni ə //UK // (vəˈləʊnɪə) //

瓦隆尼亚,瓦罗尼亚,缬氨酸,缬草

Definitions

n.名词 noun

1
- : acorn cups of an Old World oak, Quercus macrolepis, used in tanning, dyeing, and making ink.

Greek valonia is greyer in colour, and contains 26 % to 30 % of tannin.
Greek valonia is obtained from many parts of the Archipelago and mainland.
The Smyrna or Turkish valonia is best, and contains 32 % to 36 % of an almost white tannin.
As the acorn has practically no tannin value, the Greek valonia 36 contains only 25 to 28 per cent.
Of late years, very large quantities of valonia have been made into extract at two works in Smyrna.