Regulation 153

“Tea” shall be the leaves and leaf-buds of any of the varieties of Camellia sinesis, prepared by the usual trade processes.

Tea shall yield not more than 7% (w/w) or less than 4% (w/w) ash, of which at least one-half shall be soluble in water. It shall yield at least 30% (w/w) of water soluble extract. It shall not contain spurious, exhausted, decayed, mouldy leaves or stalks, or any matter for facing, colouring or for any other purpose.