Red cabbage is grown not made
You will get a frothy red mess. The baking soda and vinegar will combine to produce carbon dioxide as the acid in the vinegar combines with the base in the baking soda. The red cabbage will will make it colorful, and the water will slow the reaction. On the other hand, red cabbage and vinegar will make a nice pickled cabbage.
Using a slotted spoon, lift the cabbage from the water, allowing the water to drain through the slots.
Boil red cabbage in water to make phenol red. This works well depending on how long you boil it will determine the strength of the solution.
Red Cabbage and Beetroot can be used but what else?
There is no such thing as purple cabbage juice because red cabbage juice is actually already purple, its just called red cabbage jucie.
The color will be red.
Filtration
red cabbage is a good universal indicator you need a red cabbage hot water and a pestle and mortar put hot water into the mortar and crush the red cabbage leaves with the pestle the water should turn purple. your own universal indicator!
Pink or red
Chop some red cabbage and throw it into boiling water.Stir until water gets purple.Filter liquid. Soak some filter paper strips in the cabbage water and let dry.
To make a cabbage change colour you usually use red cabbage you cut the cabbage up and then you dip it in a bowl of of vinegar /lemonade this changes its colour because cabbage juice works as a acid/ alkaline indicator (eg red for acid) glad to help Jordan