Materials:
1. 1/2 head of *red* cabbage or so.
2. Metal grater.
3. Pot filled with enough water to cover the grated cabbage.
4. Strainer
5. Some acid/base solutions: for an acid try vinegar, for a base - mix some detergent in water.


Methods
1. Grate the cabbage into small pieces, put in pot with water
2. Boil the mixture for 20-30 minutes, untill dark purple.
3.Remove liqued only.
4. A good acid to test with is white vinegar.
5. Add a few drops of the liquedvto your solutions, and note any color changes. The juice should turn pink in acidic solutions, and green in basic solutions.


Red cabbage contains pigments call anthocyanins. The pigments give it the red/purplish color. Anthocyanins belong to group of chemical compounds called flavonoids.

Ari Dubov