Dragon's-Blood, or Sanguis Draconis, is a gummy-resinous substance, imported from the East Indies, either in oval drops, or in large grains resembling tears.
The genuine Dragon's-blood is obtained from the Common Dragon-tree, or the Dracaena Draco, L. - It is of a dark-red colour, free from any external impurities ; and, if reduced to powder, it presents an elegant bright crimson hue. Being inflammable, it readily melts in the fire, but is not acted upon by water. In a solid form, it has no sensible smell or taste; but, when dissolved in rectified spirit, it yields a slight degree of pungency, and a deep-red tinge. This drug is also soluble in expressed oils, to which it imparts a red shade, though less beautiful than that extracted from the Alkanet. Dragon's-blood is principally employed for staining (see vol. iii. p. l65) : but, being generally sold in an adulterated state, it should be remarked, that the best kind ought always to be of a granulated consistence ; as the sort manufactured into small cakes, is of an inferior quality. - In medicine, it is at present exploded.