Black is the colour of authority and power, often associated with sophistication.
Black is both positive and negative.
Be careful using black with very dark colors. It can work, but if the colors are too similar they blend together. Black works well with bright, jewel-toned shades of red, blue and green but is the ultimate dark colour and makes lighter colours such as yellow really jump out.
Black is also the colour of mystery and invokes a sense of the unknown. People who choose black as their favourite colour are often artistic and sensitive. While these people aren’t introverts, they are careful with the details of their lives and do not share easily with others preferring to wait until they are comfortable to share their feelings.
Use the colour black to convey elegance, sophistication, or perhaps a touch of mystery.