The term 'Chimney Blackener' refers to a person who is responsible for the cleaning and maintenance of chimneys. This job involves removing SOOT, which is a black or dark grey powdery or flaky substance that is created when fuel is burned incompletely. The SOOT is usually composed of carbon particles and other materials such as ash, tar, and oils. The chimney blackener must ensure that the chimney is free of SOOT and other debris in order to prevent fires and other hazards.