Black market petrol

During the war, military issue petrol was dyed red to prevent it being used by anyone else, but blackmarketeers found ingenious ways to get round this. I first came across this on the excellent BBC series Wartime Farm and thought it would make a good idea to use in a story sometime and it was perfect for the mystery of the dodgy soldiers who brought the Italian POWs to Catchetts Farm.

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Book of the series
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Trying out the blackmarketeers’ method of filtering red petrol through a loaf of bread. It worked!