I think the colour changes to darkish brown
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When beetroot juice is added to vinegar, the acidic vinegar causes the pigments in the beetroot juice to change color. The red pigments in the beetroot juice react with the acid in the vinegar, turning the mixture a more vibrant pink or magenta color. This is due to a chemical reaction between the pigments and the acid.
it turns red[first it was purple
At a pH of 10-11 the color of the red beetroot juice change from red to yellow.
Beetroot indicator turns a yellowish or yellow color when an alkali is added.
The juice of red beetroot change the color from red to yellow at a pH greater than 10.
The juice of the red beetroot change the colr from red to yellow at a pH greater than 10-11.