Turmaric yields about 7 per cent of a yellow volantile oil containing turmerone and and zingiberene as major contiteunts and many other sesquiterpenes and monoterpenea; yellow colouring matter including curcumin or diferuloylmethane (1.8 to 5.4 per cent), desmethoxycurcumine,and bisdesmethoxycurcumine