Aminomercury chloride, with the chemical formula NH₂HgCl, is an inorganic compound formed by replacing a chlorine atom in a mercuric chloride (HgCl₂) molecule with an amino group (-NH₂). It is a white or yellowish powder with strong hygroscopicity that quickly decomposes when exposed to air, releasing hydrogen chloride gas and mercury vapor, so special care is required when handling.

1. Pharmaceuticals: Aminomercury chloride was once used in the pharmaceutical industry as an ingredient in some drugs, but these uses have been phased out due to their toxicity.

2. Chemical synthesis: As a catalyst or reagent for chemical reactions, aminomercury chloride has been used in organic synthesis to catalyze specific reactions.

3. Electroplating: Mercury chloride aminol has been used in the electroplating industry, especially as a catalyst in silver and gold plating processes.

4. Wood preservatives: Aminomercury chloride was once used as a wood preservative, but this use has been banned due to its environmental and health hazards.

5. Pesticides and fungicides: Aminomercury chloride was once used in agriculture and public health as an insecticide and fungicide, but these uses have also been phased out because of their toxicity.

6. Thermometers and manometers: Mercury aminochloride was once used in the manufacture of filling fluids in thermometers and manometers because of its large density and coefficient of expansion, which is suitable for accurate measurements in these instruments.