1. "Est noir" (most common): This is the literal translation of "is black" and is used to describe something that is black in color.
Example: "Le chat est noir." (The cat is black.)
2. "Est foncé": This means "is dark" and can be used to describe something that is black or very dark in color.
Example: "Le chocolat est foncé." (The chocolate is dark.)
3. "Est de couleur noire": This is a more formal way to say "is black."
Example: "Le tableau est de couleur noire." (The painting is black.)
The best way to translate "is black" depends on the context of the sentence and the nuance you want to convey.