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Smelling salts are a chemical compound that releases small amounts of ammonia gas, which essentially jump starts your bodyâs nervous system. The ammonia causes blood vessels in your nasal passages to expand providing an instant increase in oxygen to your brain meaning an instantaneous boost of alertness and power.
--Ted. Baking ammonia, also known as ammonium bicarbonate, is a white powder or crystal that was used for leavening baed good prior to the creation of modern baking powder. I wrote an article about it a few years ago -- What is Baking Ammonia.