Who knew - add baking soda to the water when hard boiling eggs and the shell will come right off ~~ add 1/2 tsp of baking soda to the water it will make the egg shell easier to peel. True!
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To test if baking powder is still active, spoon 1/2 teaspoon in a bowl and pour 1/4 cup (60 ml) of boiling water over it. Right away it should bubble up violently. If it does, it’s still good. If it doesn’t, discard it and open a new tin.