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Milk Quality Resazurin Test

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The Resazurin test is designed for assessing the quality of raw bulked milk.

This is essentually a rapid bacteria estimation and can be carried out either as a 10 minute pass or fail, a 3 hour triple reading test or as the standard and generally accepted 1 hour test.

Resazurin gives milk a characteristic blue colour and the test is based on the ability of bacteria in the milk to reduce the blue dye. The quality of the milk is judged by noting the degree of colour change - from blue through mauve and purple and pink and finally colourless - after a stated period of incubation, or the time required to reduce the dye to a predetermined colour.

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