Birchall Green Tea Envelopes 250's A purifying and restorative traditional Chinese green tea, rich in anti-oxidants. This Green Tea is a pure green tea sourced from China where the very best teas of this variety are to be found. For centuries these teas have been revered across the Far East for their therapeutic properties. They are a rich, natural source of anti-oxidants, which are known to cleanse, detoxify and restore natural balance.