Solution
Solution 1: Dissolve 10 grams ferric ammonium citrate in 30 ml distilled water. Solution 2: Dissolve 1.5 grams tartaric acid in 30 ml distilled water. Solution 3: Dissolve 4 grams silver nitrate in 30 ml distilled water. Combine the 3 solutions and stir well. Add enough distilled water to make 100 ml of solution. The solution will keep for several weeks if stored in a cool, dark place.
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