nigrify

Example:He tried to bluff his way through the interview, but his nerves blackened his voice.

Definition:To make something black or darker, often through staining, soiling, or becoming black due to heat, age, or oxidation.

Example:With a dip in this dye, the wood floor was nigrified to a deep brown.

Definition:To color something with a dye, often to a specific shade or color, including black or dark colors.