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In fact, yeast has a shelf life, and if it exceeds the shelf life, it means that it cannot continue to be used
If the purchased yeast powder is hard-packed, it can be stored at room temperature before opening the market.
Put a small half bowl of water in the bowl, warm water at 35-40 degrees, add a spoonful of sugar and mix well, then add 2 spoons of yeast and mix well, put it in a warm natural environment, do not move, wait 5-10 minutes to see if there is any foam on the surface Plastic, there is foam is that there is specificity
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The above is the relevant introduction to the common knowledge of yeast.