In this activity, learners test the pH of safe liquids available at home by creating a pH indicator from mashed blueberries. Once learners are finished testing the pH of liquids, they can use their remaining blueberry indicator and paper towels to create homemade pH paper to test even more liquids. Activity includes detailed step-by-step instructions with pictures, optional extensions, discussion questions, and a section explaining the science behind the activity. SAFTEY NOTE: Never mix chemicals without researching their reactions. Some chemical reactions can produce harmful gases. Do not use ammonia or bleach for any chemistry experiments at home.