Yeast can still be used after half a year. When used, increasing the dosage will reduce its activity after the shelf life, but it will not endanger health. Yeast activity can be tested by dissolving yeast in warm water (a little sugar can be added). The foam and unique smell produced in this process show that yeast is still active, which was once one of the necessary steps in baking bread.

Yeast can still be used after half a year. When used, increasing the dosage will reduce its activity after the shelf life, but it will not endanger health. Yeast activity can be tested by dissolving yeast in warm water (a little sugar can be added). The foam and unique smell produced in this process show that yeast is still active, which was once one of the necessary steps in baking bread.