Contains: starter and instructions. No bulk fillers, commercial yeast or preservatives added. In early California, sourdough was as much a part of the Goldrush of 49 as gold itself. The sourdough culture traveled throughout the West in the packs of miners and settlers, and eventually found its home in San Francisco. The air in the Golden Gate region enhanced the bread made there with a wonderfully distinct taste. San Francisco has become world renowned for sourdough bread. Goldrush Sourdough Starter has taken the mystery out of making sourdough bread! With Goldrush Sourdough Starter and recipes it is easy to create the tangy flavor and hearty aroma of sourdough bread anywhere in the world! It works in bread machines too. www.Goldrushproducts.com.