cabbage science

The other day I did a science experiment but did'nt post because I posted "flags of the nations" .Well anyways the experiment went as follows:
 You soak a purple cabbage leaf in boiling water and let it sit. You then get 3 cups all apparently containing pure water. In fact only one contains pure water, the others containing white vinegar and the other containing biocarbonate of soda (baking soda) mixed with water. You pour the cabbage water into each cup and strangely the water becomes pale purple, the vinegar turns red, and the biocarbonate of soda turns green.

The cabbage juice has the property of turning red in acid and green in alkaline liquids. The water which is neutral just waters it down.

P.S. If you are wondering about the second picture I did a real experiment like I mixed soapy water with the cabbage juice. As you can see in the picture it was neutral.