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Originally Posted by sddarkman619
But what if you don't have yeast to add?
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Then you take you chances with WILD yeast. Many fruits have a natural yeast on them. One recipe I saw starts with old bread to grow yeast. ... Anyway, most recipes call for dividing the yeast culture in 1/2 then adding a equal amount of flour & sugar for 5 or more cycles. This is to manure the yeast and weed out the undesirable yeast. .... Old or outdated yeast may not be good for baking but it can still be used to start a yeast culture.
You need yeast to grow yeast! It is best to start with known good yeast. Then you can store yeast long term by bottling or freezing for future use and/or starting a new yeast culture.