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==Chemical Composition==
Analysis has shown a brown, resinous, acrid substance, insoluble in potassium hydroxide and probably containing pelletonin, two oils soluble in potassium hydroxide - one dark brown and acrid, the other yellow - tannin, gum, potassium sulphate and carbonate, potassium chloride, calcium phosphate and carbonate, silica, alumina, lignin, etc. An alkaloid, Pyrethrine, yielding pyrethric acid, is stated to be the active principle.<ref name="chemical composition"/>
==Common names==