Formazin hazes

Unfortunately the EBC and the ASBC have adopted different scales. The EBC mix equal volumes of a 10% (w/v) solution of hexamethylene tetramine and a 1 % (w/v) solution of hydrazine sulphate. After 24 hr this stock suspension (10 ml) is diluted to 100 ml to give a solution which contains 100 EBC Formazin Haze units. In a similar manner the ASBC regard the haze formed from 0 0725 g hydrazine sulphate and 0 725 g hexamethylene tetramine diluted to 100 ml as equivalent to 10 000 Formazin Turbidity units. It must be remembered that haze is not a quantity of substance but an... 

ASBC Turbidity units = 225 EBC Formazin Haze units... 

To return to the two main different types of soft drinks one is a clear product, with virtually no or only very slight turbidity visible to the consumer the other type is a turbid product with different degrees of turbidity from slight haze to complete opacity. Figure 5.31 visualises the two categories by measuring the FNU value (Formazin Nephelometric Unit). 

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