I like the option of using common products to test my soil (vinegar and baking soda). I’m familiar with the color difference you can achieve, by using either of these, from works I’ve done dyeing natural fibers in the past. I’ve had a compost bin in my yard for years, though I think we could be more active about working it so that it can produce finished compost more quickly as well as accept more of our waste. It’s amazing how much compost space is needed in a yard to process the leaves, plants and kitchen waste for one home.