Impra Citrus Black Tea, Big leaf.200 g. It is ISO 22000(2005), HACCP, gramsP, BRC, NASSA, USDA Impra Teas have been able to achieve recognition through stringent quality control measures adopted on a continuous basis, conforming to internationally accepted and recognized quality systems of manufacture. The lush plantations provide a tantalizing variety of teas with flavors and aromas to excite the taste buds of even the most discerning tea connoisseurs around the world. Impra Teas was founded in 1994. Ever since 1998 Imperial has remained within the Top 10 Tea Exporters of Sri Lanka.