Pyrolysis oil are affected by temperature, reaction time, algae species, algae concentration, reaction atmosphere, and catalysts, in subcritical water reaction conditions. Bio-oil typically requires significant additional treatment to render it suitable as a refinery feedstock to replace crude oil derived from petroleum, coal-oil, or coal-tar. Tar is a black mixture of hydrocarbons and free carbon obtained from a wide variety of organic materials through destructive distillation. Tar can be produced from coal, wood, petroleum, or peat. Wood-tar creosote is a colourless to yellowish greasy liquid with a smoky odor, produces a sooty flame when burned, and has a burned taste. It is
Wright's Coal Tar Soap and proprietors of "Wright’s Coal Tar Soap" and other coal tar specialities". It soon became necessary for the company to lease adjoining premises, until in quick succession numbers 44, 46, and 48 were added to the original warehouse at Southwark Street. Wright met an 'untimely death' in Dundee in September 1877: "he caught a cold in the face, which developed into erysipelas, the inflammation extending to the brain, he succumbed with great suddenness at the age of fifty one". Erysipelas is an acute infection of the skin and underlying fat tissues, usually caused by the streptococcus bacteria. Two of his