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how do I test baking powder for freshness? Answered

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Z..

9 years ago

Hot water! Put a teaspoon of it into a cup, and pour very hot water-about a dessertspoon full on it. If it foams, it's good to go!

Second Lemonie's comment. I've been using the same can for a decade.

As an inorganic material, baking powder doesn't lose "freshness" like perishable foodstuffs. The worst that will happen to it is that it will get damp - which should be noticeable from it's appearance. If it's not a dry and free-flowing powder it's "gone-off" a bit. If it's a solid-lump it's "gone off" a lot. L