Red Cabbage

Red cabbage (Brassica Oleracea) contains a pigment molecule called flavin (an anthocyanin). This water-soluble pigment is also found in apple skin, plums, poppies, cornflowers, and grapes. Very acidic solutions will turn anthocyanin a red color. Neutral solutions result in a purplish color. Basic solutions appear in greenish-yellow. Therefore, it is possible to use Red cabbage as an ambient media to display certain humanistic organic information by controlling the pH. The picture above shows the range of color that can be achieved by red cabbage in different pH.