Gold dissolves in mercury, forming amalgam alloys.

Diagnostic tests, cardiac catheters, hearing aids, and amalgam alloys used to fill cavities are examples of class II devices.

An amalgam alloy is a device that consists of a metallic substance intended to be mixed with mercury to form filling material for treatment of dental caries.

Amalgam is a metallic filling material composed from a mixture of mercury (from 43% to 54%) and powdered alloy made mostly of silver, tin, zinc and copper commonly called the amalgam alloy.

Subsequently, silver particles were sintered onto the glass, and a number of products then appeared where the amalgam alloy content had been fixed at a level claimed to produce optimum mechanical properties for a glass cermet cement.

Silver containing GICs (e.g. the cermet, Ketac Silver, Espe GMbH, Germany) or the "miracle mix" of GIC and unreacted amalgam alloy have been especially popular.

It dissolves in mercury, forming amalgam alloys; is insoluble in nitric acid, which dissolves silver and base metals, a property that has long been used to confirm the presence of gold in items, giving rise to the term acid test.