GB805269A - Improved tea preparation - Google Patents

Abstract

A tea preparation is produced by withering green tea leaves, boiling them with water, separating the resultant liquid from the leaves and extracting it with ether or other solvent, concentrating and filtering the aqueous extract, evaporating it to dryness and powdering the residue which is mixed with the product obtained by successively washing the ether extract with water and drying and evaporating it. Preferably the leaves are withered by exposing them to open air for about 3 1/2 hours and then they are boiled with water in a covered vessel for about 20 minutes, 4 to 5 1/2 and preferably 4.8 pints of water being allowed per pound of tea. The leaves may be pounded in a mortar before extraction. The liquid is poured off the leaves and when cool is extracted with ether. The aqueous extract is evaporated to a small volume, filtered and evaporated to dryness on a steam bath and powdered. The ether extract is washed with water, dried with anhydrous sodium sulphate and evaporated at room temperature by blowing with air. The extracts are then mixed. According to the Provisional Specification, green tea is crushed by passing it between rollers and then fermented, fermentation being assisted by sugar or the like, after which the liquor is expressed from the leaf, evaporated and dried.