colourman
/ˈkʌləmən/noun
1A person who sells and (formerly) prepares artist's paints.
2A person employed to work with paint or colour; especially a commercial painter or colourer. Now rare.
3 US Broadcasting. A commentator, especially for a sporting event, who supplements the main commentary with background information, expert analysis, etc.
Origin
Mid 17th century; earliest use found in Richard Head (?1637–?1686), writer. From colour + man.