How do you neutralize Purple Cabbage Juice?

To neutralize purple cabbage juice, which is a natural pH indicator, you can add an acidic substance such as vinegar or lemon juice. The acidity will change the color of the juice from purple to pink or red, indicating that the pH has become more acidic. Alternatively, adding a basic substance like baking soda will turn the juice green or blue, showing a shift towards a more alkaline pH. Always add the neutralizing agent gradually and mix well to observe the color change.