Cream of Tartar Does It Expire

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Cream of tartar is actually a powdered acid called potassium bitartrate. It forms naturally inside wine barrels, which is a fun little fact to drop at a dinner party. Its job is to stabilize egg whites, make sugar cookies chewy, and tell your baking soda to “wake up and make bubbles.”

If it’s too old, it simply won’t do that job. It’s like asking a retired racehorse to run the Kentucky Derby—it might look the part, but the spark is gone.

So, How Do You Know If It’s Still Good?

Your jar might look fine, but you need to do a quick scientific test in your own kitchen. No goggles required! Just mix half a teaspoon of cream of tartar with a quarter cup of hot water, then add a pinch of baking soda.

If it fizzes aggressively, like a happy little volcano, your cream of tartar is fresh and ready to party. If it just sits there, looking sad, then it’s lost its mojo. Throw it out and buy a new one. It’s not worth ruining your meringue.