English: This is a reaction between carbon disulfide and nitrous oxide. The equation for this reaction is: carbon disulfide reacts with nitric oxide, which releases carbon dioxide, nitrogen and sulfur, which is then deposited on the walls of the cylinder and which is very inconvenient to wash off. The reaction is very beautiful, during which a bright flash occurs, and the so-called dog barking. Therefore, this experiment is called a barking dog. Before the invention of camera flashes, this reaction often has been used as the illuminator for photography.