I have a 5lb can of Calumet Double-Acting Baking Powder. I have had it for about 20 years. It has never been opened. The question I have is how long was this baking powder good for? Thank...

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sugarlucky22

I have a 5lb can of Calumet Double-Acting Baking Powder. I have had it for about 20 years. It has never been opened. The question I have is how long was this baking powder good for? Thank You

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