Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Blau gas (German: Blaugas) was an artificial illuminating gas similar to propane named after its inventor, Dr. Hermann Blau of Augsburg, Germany. It was manufactured by decomposing mineral oils in retorts by heat, and compressing the resulting naphtha until it liquefied. It was transported in this condition, and like LPG on releasing the pressure assumed again the gaseous state. Chemically, it is similar to coal gas.

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