A Comparison of the Bromthymol Blue Milk Test and the Methylene Blue Reduction Test for Determining Quality of Milk

Summary The bromthymol blue milk test was found to fulfill its purpose in that it graded milk fairly accurately into a large number of classes according to keeping quality, when average scores were studied. The reduction test was found to fluctuate more but was able to grade the milk into four classes equally as accurately. The correlation coefficients between each test and the keeping quality were both found to be +0.77.