The New International Encyclopædia/Aurin
AU′RIN (Lat. aurum, gold), C19H14O3. A coloring substance used in the manufacture of lacquers. It is obtained in the form of beautiful green needles, by the action of sulphuric and oxalic acids on carbolic acid at 130-150° C. Reducing agents transform it into a colorless substance known as leucarin, C19H16O3. Owing to the difficulty of fixing it, it is not much used as a dye, though its solution in alkali has a beautiful fuchsine red color.