Butanone (Bethany Keaton) or Methyl Ethyl Ketone (MEK) is the second Ketone.
Butanone spends her whole life in industry, humans in industry make fun of her.
Butanone is a slim woman with wavy brown hair and blue eyes which are often seen brown in some artworks.
Butanone is a sweet person and very much like Acetone. Toluene is Butanone's best friend and co-worker.
MEK is Acetone's cousin. She's jealous of Acetone's life and fame, they have really different lives. Her mother is Butanol II.