Can you make red diesel clear?
Samuel Coleman
Updated on May 02, 2026
One of the most common is to remove the red coloration from the diesel. In the UK, a diazo dye — Solvent Red 19, 24 or 26 — is used to colour the diesel. Fraudsters can remove the colour using an acid or alkali which renders the dye colourless, or by stripping the dye from the diesel using activated carbon.