human
How can I tell if my sourdough starter is alive?
assistant
Check to see if the starter has risen in size. If it hasn't, then your starter may not be alive and needs to be fed more often. 2 Check for bubbles in the starter. These are a sign that the yeast is working and producing carbon dioxide. 3 Take a sample of your starter and check its pH level. A sourdough starter should have a pH between 3.5 and 4.5.