It depends on the "Mrs." you are addressing. I could be either Madam or another variety of "Mrs."
pitch black is translated 'nuit noire' in French.
Black gloves are 'des gants noirs' in French.
bonjour madame Knight
bonjour, madame Ann.
Black bear in French is "ours noir."
Je m'appelle madame Mason
in French, black beauty is 'beauté noire'
You would say "chien noir" in French.
A beautifu black butterfly is "un beau papillon noir" in French.
cheveux noir
Noir.