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Probably not. To test it, heat about 1 cup (250 ml) of water to about 115F (40C) and then dissolve about 1 teaspoon (5 gm) white sugar in it. Add about 1 teaspoon of your yeast and let it sit for about five minutes. If its good you should see it foaming away. Do not over heat the water or you WILL kill the yeast and you'll never know if your yeast is good or not.

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Q: Is dry yeast good if it has been in a air tight container in the cabinet for one year?
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