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When we eat nitrates, they are converted into nitrites in our digestive system, which are then converted to ammonia and disposed of by the body. Nitrites are also inorganic compounds made up of nitrogen and oxygen, but instead of three oxygen molecules they have two, NO2. Nitrates are not generally harmful unless they are consumed in massive quantities. Nitrites, on their own and in moderation, are also generally not harmful.
Composition. Black powder is made of potassium nitrate, charcoal and sulfur. These ingredients are mechanically combined in an approximate ratio around 75:14:11 to 75:15:10 respectively. The recipe is a bit forgiving as to the exact quantities of each ingredient.