I made some pizza dough the other day and it just didn’t rise. That got me wondering if my yeast was still active as the dough just didn’t rise at all. There are several methods for testing or proofing yeast to see if it’s still active. I used the process that eHow outlined to test my yeast.
I bought this yeast bulk and still have a large jar of it. So I followed the following steps to test it for its potency:
Let it sit for 10 minutes. If foam and bubbles form, your yeast is still active. As you can see my yeast didn’t have much activity at 10 minutes but after 20 minutes this was my results.
Bottom line — I think my yeast is just okay but will proof it again before using it in a recipe. I hope you find this tip useful and use it next time you want to proof your yeast.