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Litmus milk medium is skim milk to which the dye litmus has been added. Litmus is both a pH indicator and a redox indicator. It is pink at pH < 4.5, purple in middle pH's and blue at pH > 8.3. As a redox dye, in the absence of oxygen (reduced state) it's colorless (white due to milk) and in the presence of oxygen (oxidized state) it is purple.

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15y ago
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10y ago

Litmus is used as an indicator for pH, or the acidity of something. The litmus in the litmus milk acts as a redox indicator because a litmus is also a redox indicator as well as pH indicator.

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Q: How does litmus in the litmus milk act as a redox indicator?
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