'self-colored' is formed in English from 'self' meaning 'of itself' and 'colored' meaning 'having color', indicating something that is colored uniformly by itself.

'self-colored' was coined in English by combining 'self' and 'colored', and has been used since the 19th century to describe materials or objects of a single, uniform color.

Initially, it meant 'having its own color', and over time it has come to specifically mean 'having a uniform color throughout, not patterned or variegated'.