Take some potassium iodide and mercuric nitrate(or chloride) [all are white powders] and mix well. 1/5th of a teaspoon of each will be enough. Now, place the powder mixture on one side of a white paper. Fold the other side over the powder and rub the solid through the paper with your fingers.
The powder that has been rubbed well changes its colour from white to red, as mercuric iodide is formed.
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