Red cabbage juice will turn green in what substance?

Red cabbage juice will turn green in alkaline substances.

Here's why:

* Red cabbage juice is a natural pH indicator. This means it changes color depending on the acidity or alkalinity of the solution it's in.

* In acidic solutions, red cabbage juice turns red or pink.

* In neutral solutions, red cabbage juice remains purple.

* In alkaline solutions, red cabbage juice turns green or blue.

So, if you add red cabbage juice to a solution like baking soda (sodium bicarbonate) which is alkaline, it will turn green.