The process of drying out a portion of active sourdough culture to a shelf-stable state is a method of preservation. This technique removes moisture, rendering the culture dormant yet viable for later reactivation. The final product typically resembles flakes or powder.
This preservation method offers several advantages, including extended shelf life and ease of storage and transport. The dried culture can endure for months, even years, eliminating the need for constant feeding. This is particularly beneficial for those who bake infrequently or wish to share their culture with others across long distances. Historically, drying cultures has allowed bakers to maintain their lineage of starter across moves or periods of inactivity.