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The Red cabbage experiment is a method of creating colours and patterns based on using liquid from red cabbage as a pH indicator. The red cabbage, lat.Brassica oleracea capitata var. Rubra, contains a pigment molecule called flavin. Flavin is an anthocyanin. This water-soluble pigment is also found in plums, red poppies, blue cornflowers and grapes. The anthocyanines change colors in contact with different acid liquids. Very acidic solutions will turn the anthocyanin into a red color. Neutral solutions result in a violet color. Basic solutions will appear greenish-yellow. Making surface chemical reactions using photo print paper as a colour indicator. Experiment with different liquids. The liquids used in the experiments above are bath salts, body colours, butter, coffee, dark room chemicals, ink, kiwi juice, plum juice, soy oil, soy sauce, vinegar and water. The experiments are made on a photo print paper with a special chemical compound. Combined with the cabbage the chemical surface affects the colour results. Materials and equipment: Red cabbage Water Liquids Glossy photo print paper Knife Board Small bowl Large bowl Strainer Q-tips |
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Chop the cabbage into pieces. |
Put the pieces in the small bowl and cover them with water. Store the cabbage solution until the water turns violet. |
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Strain the solution in the large bowl. |
Now you have got a pH indicator. |
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Put a piece of photo print paper in the solution. The paper should be covered from 2 – 10 minutes, until it changes colour. Remove the paper and dry it. |
Dip the q-tip in one of the suggested liquids and drip your red cabbage experiments on the paper before drying. |
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