如何判断发酵粉是否还不错
Baking powderdoes not last forever. Because it’s sensitive to moisture and humidity, it generally has a shelf life of between six months to one year. Baking powder should be kept in a cool, dry place, such as inside a cabinet, and should be discarded when it is no longer active. (Its cousin, baking soda*, has an indefinite shelf life, although some manufacturers recommend changing it every three years.)
To test if baking powder is still active，将1/2茶匙倒入碗中，然后在其上倒1/4杯（60毫升）的沸水。马上应该猛烈起泡。如果确实如此，那仍然很好。如果没有，请丢弃并打开新的锡。
相关链接
Why you should use aluminum-free baking powder(and how to make your own)
*和...之间的不同baking powder和baking soda(bicarbonate of soda) is that baking soda requires an acid ingredient in a recipe to activate it, such as vinegar, buttermilk, coffee, or yogurt.
Baking powder将小苏打作为其成分之一，以及激活它的酸性成分，因此可以用于没有其他酸性成分的食谱中。小苏打和发酵粉在食谱中不可互换。
