Yesterday I was at the Wein and Saengerfest in New Braunfels, TX. There was a tent there where people could stomp grapes and then place their grape-juiced footprints on T-shirts (50% cotton and 50% polyester). The footprints were sprinkled with table salt and allowed to air dry. The people stepped into a bleach water solution afterward to remove the dye from their feet. It was interesting to me how different feet seemed to absorb the color differently. The directions that came with the shirts say to soak them in vinegar for 10 minutes, then machine or hand-wash in cold water separately or with like colors. It dawns on me that a science club could do this on T-shirts featuring anthocyanin molecules and/or witty sayings (e.g. Chemistry is a Juicy Subject).
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