Fuel dye

The high-solubility liquid dyes originated with Morton International and BASF (ACNA Italy) as the primary inventors.

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.

With the implementation decision (EU) 2022/197 by the European Commission, ACCUTRACE Plus, developed by Dow Chemical Company, replaced the Euromarker Solvent Yellow 124 dye on January 18, 2024.

[3] Residues from both Accutrace and the previous Euromarker dyes persist in fuel tanks and filters long after the illegal gas oil has been discontinued.

In the United Kingdom, "red diesel" is dyed gas oil for registered agricultural or construction vehicles such as tractors, excavators, cranes and some other non-road applications such as boats.

[5] On 18 November 2014, a new measure to combat fuel laundering was set to result in the illegal trade being "virtually eliminated" in the United Kingdom, according to HM Revenue and Customs.

Previously, during the time of Communist Party rule, the state-owned CPN fuel monopoly dyed leaded gasolines (marketed as "ethilins") in the following colors: 78 – blue, 86 – green, 94 – yellow, 98 – red.

In the United States of America, the Environmental Protection Agency mandates use of a red dye to identify fuels for off-road use.

Paramilitary groups connected to political unrest in Northern Ireland have established laundering plants on both sides of the Irish border.

[8] In 2009, customs officials shut down a plant capable of removing the dye from 6.5 million litres of fuel per year.

[11] Some dyes required in some countries are listed here: Diesel is labeled by adding one of the coloring matters to 1000 liters of oil products:

Plastic jerrycan containing 'red' diesel
Fuel pumps in Ireland, with green gas oil and red kerosene , and notices that it is an offence to use marked fuels in a motor vehicle
Petrol station in England, with 'red diesel' available for a lower price, but only for "off road use", i.e. agricultural machinery and similar
Diesel (black) and dyed fuel oil (MPÖ; red) dispensers at a St1 petrol station in Tornio, Finland