There are two main types of melanin that determine hair colour. Eumelanin is a black-brown pigment and pheomelanin is a red-yellow pigment. The amount of the different pigments determines hair colour.

Image: an early experimental colour programme, c. late 1950s. BBC One launched a full colour service on 15 November 1969. At midnight, An Evening with Petula - Petula Clark in concert from the ...