from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A resinoid colouring matter obtained from alkanet root.
from the GNU version of the Collaborative International Dictionary of English
- n. A resinoid coloring matter obtained from alkanet root.
from The Century Dictionary and Cyclopedia
- n. A red coloring matter obtained from Alkanna (Anchusa) tinctoria.
Its colouring matter or _anchusin_ has the character of a resin, and is dark-red, softened by heat, insoluble in water, soluble in alcohol and alkalis, and freely so in ether, fats, and volatile oils, to all of which it imparts a brilliant red hue.
To obtain anchusin, all the soluble matters are first abstracted from the bruised root by water: it is then digested in a solution of carbonate of potash, from which it may be readily precipitated by an acid.