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Oleoresin of Black Pepper

Treat 12 troy ounces black pepper in fine powder, by ethereal percolation and distillaand distillation, in the same manner as laid down in No. 4580; expose the residue after distillation in a capsule, until the remaining ether has evaphas evaporated and the deposition of piperin in crysin crystals has ceased. Lastly, separate the oleoresthe oleores-