Wood vinegar or pyro ligneous acid is the water fraction that is produced during the Pyroflash process. Raw wood vinegar is a liquid with a red-brown colour. The main component is water that originates from the biomass itself and from the chemical reactions in the reactor. The fraction is rich in carbonic acids and also contains some residual tar. Wood vinegar contains roughly 20% organic components of which the most dominant are: acetic acid 8%, furfural, propannoic acid and methoxly acids. Wood vinegar is one of the most important product of the Pyroflash technology. Its main application is soil fertiliser and also plants pesticide. The main applications of wood vinegar from the Pyroflash system is shown in the following diagram.