Prediction and Automatic Measurement of Chill Haze. M. Moll, Vinh That, D. Bazard, L. M. Vincent, and J. C. Andre. J. Am. Soc. Brew. Chem. 39:0015, 1981.

The chill haze test we have developed accelerates chill haze formation by the addition of 6% v/v ethyl alcohol to degassed beer followed by rapid chilling of this solution to-8° C and measurement of the light scattered at 90°. It allows measurement of the chill haze in less than 20 min. To do this, a basic automatic apparatus was built in which a laser is the source of light and a mini-computer handles the experiment and stores the results in a memory. The coefficient of variation of the method is less than 3%, as compared with 12-15% for other methods. The values of formazin units given by this method are up to 10 times higher than those given by other methods, which indicates considerably improved sensitivity. Correlation between this new method and time colloidal stability has not yet been determined. The correlations between this method and other prediction tests for colloidal stability are significant but mediocre (r * 0.7).

Keywords: Automatic measurement, Chill haze, Colloidal stability, Laser beam, Prediction