Maureen, that depends how long it's been in the frige. First, check to see that it doesn't smell like nail polish. If it does, or has any red or orange mold on it, throw it out. If it's separated with a gray layer of liquid on top, and smells like alcohol, it's likely ok to rejuvenate. Stir the liquid back into the starter, discard all but 4 ounces, and feed it according to the directions in our sourdough guide. Susan

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