A brownish or dull red of any description, esp. of a scarlet cast rather than approaching crimson or purple.

a dark purplish red to dark brownish red

dark brownish to purplish red

a variable color averaging a dark red.

Maroon is a colour mixture composed of brown and purple. Although conceptually a colour mixture, it can be regarded as a dark (and possibly also desaturated) shade of red. Derived from French marron ("chestnut"), it didn't become a colour-word in English until ca. 1791.