There is no such thing as purple cabbage juice because red cabbage juice is actually already purple, its just called red cabbage jucie.
IODINE
When adding tomato juice to cabbage juice, the cabbage juice turns redish
it will be purple
Red cabbage juice is purple before it is added to anything.
In the light of my expierience the colour is purple.
Basic colour of C.J. is purple blue
at first it will turn purple then it will turn pink
Alkali turns red cabbage juice blue or purple due to a chemical reaction with anthocyanins in the cabbage. This color change can be used as a natural pH indicator.
When sodium hydroxide is added to red cabbage juice, the cabbage juice will change color. The cabbage indicator will turn from red/pink to blue/purple because sodium hydroxide is a strong base, causing a shift in the pH of the solution. This color change is due to the anthocyanin molecules in the red cabbage juice reacting with the change in acidity.
...indicator. (Or, the juice of a cabbage. :) )
purple cabbage is food