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BS EN 15769:2009
Ethanol as a blending component of petrol. Determination of appearance. Visual method (British Standard)
This European Standard specifies a procedure for the determination of appearance of ethanol by visual method. The method enables to determine colour and limpidity of ethanol. NOTE Automotive fuel standards require a fuel to be clear and bright, meaning absent of particles, respectively absent of haziness. For this document that requirement is combined into a limpidity requirement.
British Standards Institution [bsi]