Sometimes,
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Watched a prog on the telly box recently, with a bit on how black marketeers in WW2 took the red dye out of army petrol. Passed it through a loaf of unsliced bread which filtered the red out. @Def90man has a supply of bread, so there ya go.
The chemistry teacher at my school when I was a lad got his favourite students, which for some crazy reason included me, to meet his former tutor at Cambridge when he came to visit him. We just basically sat and listened while they reminisced.
At one point said tutor talked about getting rid of the colour in military petrol, I think he mentioned shaking it with aspirin in it.
It turns out that both these methods worked as did filtering it through charcoal. ;)
 

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