"The corn is black."

Translation: Le maïs est noir.

[mellypower]

Le blé n'est pas acceptable...?

[Sitesurf]

"blé" is "wheat"

[EvaW39]

why is everything black?

[Sitesurf]

Because it is a color adjective easy to use (regular), while many others are exceptions to the usual rules.

[etaraikovica]

why noir not noire?

[Sitesurf]

"le maïs" is masculine.