Mystery Solved: Why Kerosene is Blue and Its Role in Curbing Illegal Trade

• Kerosene is naturally transparent or light yellow, but market kerosene is deep blue due to dyeing.
• Blue dye (Solvent Blue 35 or Oil Black 35) is added to subsidized kerosene in India to prevent illegal mixing with petrol and diesel.
• The blue color makes it easily identifiable, even when mixed, helping to curb illicit sales and ensure subsidized fuel reaches intended beneficiaries.
• This practice, implemented globally and in India since 1950, is an effective tool against illegal trade, regulated by the Ministry of Petroleum and Natural Gas.
• Despite Direct Benefit Transfer, blue dye remains crucial for identification, reflecting an economic, social, and regulatory system.