Experimental approach demonstrates coloration of fabrics with red cabbage dyes, highlighting dye-fabric interactions.
Aqueous extracts of red cabbage are used to dye multi-fiber ribbon. Varying the pH of the stock indicator solution with either household vinegar or baking soda results in fabrics that range from purple to pink to green. Household chemicals such as alum or cream of tartar may be used as mordants resulting in different colored fabrics. Use of the multi-fiber ribbon allows one to easily discuss the interaction of dyes with different fabric types. This experiment is especially suitable for nonscience majors.
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Henderson et al. (2009) studied this question.
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