There were two brands of paraffin in the UK in the Sixties: Aladdin Pink Paraffin and Esso Blue. They were delivered in Morris vans. I don't know if the colouring meant anything. Anyone British over 50 will remember the intensely annoying TV commercial for Esso Blue, blue blue ... blue, blue, blue... Esso blue. Blue, blue, blue (repeat ad nauseam).
Tim
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