Chemistry live and in color: I had fermented red cabbage and weighted it down with yellowish flint stones so it wouldn’t float. The red cabbage had retained its typical deep red-purple color the whole time. Now I’ve put the stones in the sink to clean them and am delighted by the vivid blue, almost turquoise color. Apparently, there was more limestone in the pebbles than I had suspected. Now that the acidity of the surrounding cabbage juice was gone, the color change took place—just like back in school. However, I really hadn’t expected this intense shade. I’ll probably take a few soil samples next week and use the cabbage juice to test just how acidic or alkaline our soil really is. Why buy test kits when you have red cabbage? 😜