Fleischmann's Active Dry Yeast is the best-known of their yeast products due to its innovative extended shelf life compared to fresh yeast.
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If the top resembles a mushroom, excess yeast _ or fast-rising or bread-machine yeast used in the amounts indicated for regular active dry yeast _ should be suspected.
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When frozen, active dry yeast maintains its freshness long past the " use by " date; it can be kept two to three years in the freezer, Brody said.
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Proofing yeast ( as opposed to proofing the shaped bread dough ) refers to the process of first dissolving yeast in warm water, a needed hydration step when using active dry yeast.