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It needs to be done by processing. It's naturally clear - but dyes are added to certain blends - to identify the use for which it was intended. Here in the UK - they do the same thing to diesel fuel... Diesel intended for use in farm vehicles (which are tax-exempt) is dyed red. This is to stop 'regular' motorists using it (thus defrauding the tax system).

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7y ago

What else can I help you with?