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When preparing pills with silver nitrate, add (in agreement with the doctor) 3-4 drops of diluted nitric acid, which protects the lapis from decomposition. Without nitric acid, the pills, no matter how carefully they are prepared, darken after a few hours. Silver nitrate is dissolved in a few write me a essay of water, 3-4 drops of diluted nitric acid are added, and then mixed with 3 g of aluminum hydroxide and covered with water. It turns out a white, relatively stable mass; the color of the pills rolled out of it does not change for more than 30 days.