The degree of turbidity present in a beer sample can be compared to beer containing EBC formazin standard solution for producing turbidity or haze through visual evaluation or determined with a device for measuring turbidity. The EBC scale is based upon a standardized formazin suspension. As an alternative, AEPA turbidity standard (styrene divinyl benzene suspension produced by Norit Haffmans, www.haffmans.nl) may be used. Clear, opalescent and turbid are the three levels of turbidity discernable by visual evaluation.
The turbidity of the beer is determined in order to evaluate how well the bottled beer can be stored and, if necessary, to predict the stability over time of the beer using the forced aging test
This method is suitable for filtered top-fermented and bottom-fermented beer.
The degree of turbidity present in a beer sample can be compared to a clear beer of the same brand and style to which EBC formazin standard solution has been added to produce haze in the beer. The degree of turbidity can be determined through visual comparison of the two beers.