Colour - Black

Good black

• Black tie - formal (as in formal party attire)
• Black belt - expert (especially in martial arts)
• Blackwash - bring things out in the open In the black - having money, doing well in business
• Men in black - government agents
• Black box - equipment or apparatus
• Pitch black - dark as night, very black 

Bad black

• Black out - Loss of consciouness or the act of erasing something
• Blackout - loss of electricity or turning out the lights
• Black eye - damage such as damage to one's reputation, slander, unpopular
• Black-hearted - evil
• Blackguard - a scoundrel
• Black sheep - an outcast from a family or from society
• Black market - illegal trade (goods or money)
• Blackmail - obtaining something by threat
• Blacklist - list of people or organizations to boycott, avoid, or punish