Accutrace Plus

Machine-translated from the German article

Accutrace Plus (own spelling ACCUTRACE™ Plus) is a colorless additive that can be added to fuels to mark them. It was developed by the Dow Chemical Company and is mandated in the European Union for marking fuels, replacing Solvent Yellow 124, which had lower resistance to various chemical and physical removal processes. Its best-known application is marking tax-advantaged heating oil, so that spot checks can determine whether drivers of diesel cars are using heating oil instead of the more heavily taxed and therefore more expensive diesel fuel from filling stations, which is prohibited.