adjective / noun
auburn
AW-bern/ˈɔːbərn/
A reddish-brown color, especially of hair.
Sunlight reveals the warm red tones in her auburn hair.

Etymology
The ancestor meant whitish, and auburn originally described a pale or flaxen color. Influence from brown shifted it to reddish brown, especially as a description of hair.
In context
whenever you formulate with Reds to always add in Browns if you need it to be more of an auburn color