Acetonitrile

Acetonitrile (Methyl Cyanide, Antoinette Nightingale) is a nitrile who does not work closely with humans anymore. She is Hydrogen Cyanide's younger sister and Acrylonitrile's older sister.

Personality
Unlike her siblings and other Cyanides, Acetonitrile is a very calm and tolerant person. She has very dark sense of humour and this was kind of annoying for her customers when she was working in a nail salon.

Hydrogen Cyanide hates her and excludes her at any chance. To him, Acetonitrile had failed being a Nitrile by not conforming to the "highly toxic" standards (Nitriles are not as deadly as Cyanides, yet still very toxic).

Appearance
Acetonitrile has short brown curly hair and blue eyes. She has dark skin like her siblings. Acetonitrile looks very much like her younger sister Acrylonitrile.

History
Acetonitrile worked in Acetone's nail salon until 2000. Acetone accepted her as an employee despite Ethyl Acetate's warnings about Acetonitrile being a cyanide and it was an immutable fact of her nature. Acetone believed that, as a nitrile, Acetonitrile was different from cyanides out of her love of Acetonitrile.

After death of a child in 1999, Acetonitrile was blamed by Acetone for the murder in March 2000. She was forced to quit her job as a result, later Acetonitrile tried working in a pharmacy and a battery factory.