Is it an acid, base, or neutral? Make your own acid-base indicator from red cabbage, then test various household substances. Acids and bases are classes of materials that have different properties.

Take 1/4 red cabbage. Finely slice the cabbage ... is also used to create the scale by which we measure acidity: the pH scale. The scale spans from 0 to 14, with pH 7 being neutral (water).