it tests for carbonic acid
If you want to make a purple indicator, just cut up some purple cabbage and cook it in boiling water for about 5-10 minutes or until it turns purple. When you place another substance in it it will turn pink if it is acidic, and if if turns a green it is a base...... if it stays purple the substance is neutral.
put small pieces of purple cabbage in hot water and stir it and leave it for 20 min and take only water. if indicator turns substance red it is acidic ,if blue then basic if no change then neutral
There is no such thing as purple cabbage juice because red cabbage juice is actually already purple, its just called red cabbage jucie.
The purple bougainvillea indicator will remain purple if the substance is acidic. Bougainvillea indicator turns pink in basic solutions and remains purple in acidic solutions due to the color change of its pigments in response to pH.
More than likely, it is probably red cabbage. While it is called "red cabbage," it is actually purple when raw.
If you blend red cabbage with water (the best ratio for this is 1:2, one cabbage leaf for two cups of water) and then add toothpaste the mixture will turn green. This indicates that toothpaste is a base. If you add vinegar instead the solution will turn red, indicating an acid.
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!
purple cabbage is food
You eat the leaves of the purple cabbage, just as with the green cabbage.
Alkalis turn red cabbage juice blue/green/yellow.
acidic - magenta basic - no colour change
You would use a grinder and a grind to mash up the cabbage therefore creating a purple/dark red liquid