Decolourise with aniline oil till no more colour is discharged.
Treat with a mixture of equal parts of aniline oil and xylol until no more colour comes away.
Suppose we go a step further and boil the aniline oil with acetic acid, which is the acid of vinegar minus its water.
chemical base used in making colorful dyes, 1843, coined 1841 by German chemist Carl Julius Fritzsche (1808-1871) and adopted by Hofmann, ultimately from Portuguese anil "the indigo shrub," from Arabic an-nil "the indigo," assimilated from al-nil, from Persian nila, ultimately from Sanskrit nili "indigo," from nilah "dark blue." With chemical suffix -ine (2).
aniline an·i·line or an·i·lin (ān'ə-lĭn)
An oily, poisonous benzene derivative used in the manufacture of dyes and pharmaceuticals. adj.
Derived from aniline.