The dry powder of the leaf should not be used because the essential oil volatilizes and a large proportion of it is lost, which is the most active principle of the drug.
"The Medicinal Plants of the Philippines"
T. H. Pardo de Tavera
The metal volatilizes easily, giving the characteristic coating.
"The Elements of Blowpipe Analysis"
Frederick Hutton Getman
volatilizes before the Bp.
"The Elements of Blowpipe Analysis"
Frederick Hutton Getman