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Manjakani or "Oak galls" comes from oak trees indigenous to Asia Minor and Persia. They are produced when the leaves of the oak tree (Quercus infectoria) are penetrated by stinging wasps. The spontaneous chemical reaction caused by the penetration stimulates the leaves to produce a roundish hard ball called an oak gall.

The galls, known in Malaysia as Majuphal, contain tannin and small amounts of gallic acid and ellagic acid.[1]