Adjectives don't usually carry gender, just nouns. Noir is an adjective, so it isn't inherently either; it is neutral. But you would add an e (noire) if pairing with a feminine noun.
Black is an English equivalent of 'noir'. The French word is pronounced 'nwahr'. It's the masculine form of an adjective. The feminine 'noire' is pronounced 'nwahrr'.
Feminine
its masculine no doubt
Masculine
masculine
feminine
Feminine.
La pizarra is feminine, (el) is masculine, and (la) is feminine.
Une école feminine
it is masculine so El
directeur → masculine directrice→ feminine
feminine