(mineralogy) red copper oxide; cuprite / pure copper, as opposed to an alloy (cf. yellow copper)

Fraxinus pennsylvanica, a species of ash tree native to eastern and central North America. / Forest natal-mahogany (Trichilia dregeana)

A bright red colour, between scarlet and crimson.

An indurated clayey ochre containing iron, used by painters and artificers; reddle.

An ore of silver, of a ruby-red or reddish black color. It includes proustite, or light red silver, and pyrargyrite, or dark red silver.

A dyestuff, isomeric with indigo blue, obtained from crude indigo as a dark brown amorphous powder.

An ocherous red pigment resembling Venetian red, but slightly yellower and warmer. / Any red wine of Spanish origin.

rhodochrosite

Abies magnifica, a western North American fir tree.

(botany) Synonym of watermelon radish