If your sourdough starter has mold on top, it's essential to take immediate action to prevent it from spreading and potentially ruining your entire starter. Mold can be harmful and should not be consumed. Here's what you should do:
Don't Panic: It's not uncommon for mold to develop on the surface of a sourdough starter, especially if it has been neglected or exposed to unfavorable conditions.
Isolate the Mold: Carefully examine the starter and identify the extent of the mold growth. If the mold is only on the surface and hasn't penetrated deeper into the starter, you may be able to salvage it.
Remove the Mold: With a clean spoon or spatula, remove the moldy layer along with a bit of the surrounding starter. Discard the removed portion in the trash, not down the drain.
Sanitize Container and Utensils: Thoroughly clean and sanitize the container and any utensils that came into contact with the moldy starter. This will help prevent further contamination.
Refresh the Starter: After removing the mold, you need to refresh your sourdough starter. Depending on your usual feeding schedule, feed the starter with equal parts of flour and water (by weight) and mix well. For example, if you have 100g of starter, add 50g of water and 50g of flour. This will help dilute any remaining mold spores and encourage the growth of beneficial microbes.
Observe and Monitor: Keep a close eye on your starter over the next few days. Look for signs of healthy fermentation, such as rising, bubbles, and a tangy aroma. If you see any further mold growth or notice any off smells, it's best to discard the starter and start anew.
Prevent Future Contamination: To avoid mold issues in the future, maintain good sourdough starter practices. Keep the starter in a clean container, use purified or filtered water, and store it in a location with consistent temperature and airflow. Regularly feed and maintain the starter, especially if you plan to leave it unused for an extended period.
Remember that sourdough starters are living cultures, and they can be sensitive to environmental conditions. Taking proper care of your starter will help keep it healthy and thriving, reducing the likelihood of mold or other unwanted microorganisms taking over.