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Hazard Predictions

• Flammable: Reaction products may be flammable
• Generates heat: Exothermic reaction at ambient temperatures (releases heat)

Mercury reacts with hydrogen sulfide in the air and thus should always be covered (DeVito, S. C. and Brooks, W. E. 2005. Mercury. Kirk-Othmer Encyclopedia of Chemical Technology. (Online)).

Hydrogen sulfide can cause copper to incandesce, posing a fire hazard (Mellor, J.W. 1947. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Vol. 10, p. 140. Longmans, Green and Co Ltd.; Mellor, J.W. 1943. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Vol. 11, p. 731. Longmans, Green and Co Ltd.).

Silver reacts exothermically with hydrogen sulfide (Mellor, J.W. 1967. Mellor's Modern Inorganic Chemistry, 6th Edition. John Wiley & Sons, Inc. pp. 666).

Many metal sulfides are reduced to their metals by copper; copper sulfide is also produced. Metal sulfides that react in this way include aluminum sulfide, magnesium sulfide, cadmium sulfide, ferrous sulfide, nickel sulfide, zinc sulfide, lead sulfide, and mercury sulfide (Mellor, J.W. 1923. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Vol. 3, p. 83. Longmans, Green and Co Ltd.).

Gold is attacked by alkali metal polysulfide solutions (Renner, H., et al. 2000. Gold, Gold Alloys, and Gold Compounds. Ullmann's Encyclopedia of Industrial Chemistry. (Online)).