Ligroin

Ligroin is the petroleum fraction consisting mostly of C7 and C8 hydrocarbons and boiling in the range 90‒140 °C (194–284 °F). The fraction is also called heavy naphtha. Ligroin is used as a laboratory solvent. Products under the name ligroin can have boiling ranges as low as 60‒80 °C and may be called light naphtha.

The name ligroin (or ligroine or ligroïne) appeared as early as 1866. The name "ligroin" was coined in the United States: Early use in English: Early use in German:
 * From p. 349: "Ligroine; der in Amerika erfundene Name für einen der flüchtigeren Teile des rohen Petroleums, … " (Ligroin:  the name that was coined in America for one of the more volatile parts of crude petroleum, … )
 * From p. 389: "Dr. Van der Weyde then exhibited some samples of the products of distillation of tar, and a safety-lamp for burning the lighter hydro-carbons, which is mainly a reproduction of the "Ligroine" lamp invented and put into the market first by C. Schreiber in Munich (Bavaria), and described in the March number of Dingler's Polytechnic Journal."
 * See also:
 * From p. 474: "Das einzige Gefährliche ist die Aufbewahrung des Leuchtstoffes, der sogenannten Li-gro-ine selbst.  Diese Naphta oder Li-gro-ine muß, wenn in großen Quantitäten vorhanden, in wohl verschlossenen Gefäßen aufbewahrt werden."  (The one danger is the storage of the lamp fuel, the so-called "ligroin" itself.  This naphtha or "ligroin" must, if present in large quantities, be stored in well sealed containers.)

Standards
Ligroin is assigned the CAS Registry Number 8032-32-4, which is also applied to many other products, particularly the lower boiling ones, called petroleum spirit, petroleum ether and petroleum benzine.

Use as fuel
Ligroin was used to refuel the world's first production automobile, the Benz Patent-Motorwagen, on a long distance journey between Mannheim and Pforzheim. Bertha Benz added ligroin to the vehicle at a pharmacy in Wiesloch, making it the first filling station in history.

The first functional diesel engine could also run on ligroin.