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We had so much fun experimenting with a cabbage juice science experiment recently. Did you know that red cabbage juice contains a natural pH indicator that changes colors according to the acidity of the solution? Very acidic solutions will turn it a reddish color. Neutral solutions result in a purplish color. Basic solutions appear in greenish-yellow. So, it is possible to determine the pH of a solution based on the color it turns the red cabbage juice.