page_title: Solvent Yellow 124
section_title: Euromarker
hierarchical_section_title: Solvent Yellow 124 / Euromarker
caption_attribution_description: Description: Chemical structure of Solvent Yellow 124, hydrolyzed protonated form Author, date of creation: selfmade by Shaddack, 1 December 2005 Source: self-made Copyright: Public Domain (PD) Comments: b/w hires PNG; ChemDraw
context_page_description: Solvent Yellow 124 is a yellow azo dye used in European Union as a fuel dye. It is a marker used since August 2002 to distinguish diesel fuel intended for heating from a higher-taxed motor diesel fuel. It is added to fuels not intended for motor vehicles in amounts of 6 mg/L or 7 mg/kg under the name Euromarker.
context_section_description: Solvent Yellow 124 is a dye with structure similar to Solvent Yellow 56. This dye can be easily hydrolyzed with acids, splitting off the acetal group responsible for its solubility in nonpolar solvents, and yielding a water-soluble form which is easy to extract to water. Like a similar methyl orange dye, it changes color to red in acidic pH. It can be easily detected in the fuel at levels as low as 0.3 ppm by extraction to a diluted hydrochloric acid, allowing detection of the red diesel added into motor diesel in amounts as low as 2-3%.
  Solvent Yellow 124 is intended to be difficult to remove from the fuel in an economical way.  The Customs, familiar with various tricks including dual fuel systems with hidden fuel tanks, will take samples from the fuel lines to the engine itself if such equipment is suspected in the car.
  As the amount of Solvent Yellow 124 added to the fuel is known, by measuring its content in the fuel it is possible to calculate how much of the low-taxed fuel was added to the legal one.
caption: Solvent Yellow 124, hydrolyzed protonated form
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