Indium is available in ultra pure form. Indium is a very soft, silvery-white metal with a brilliant luster. The pure metal gives a high-pitched "cry" when bent. It wets glass, as does gallium.
Melting point: 156.6 °C Boiling point: 2072 °C
A foil is a thin sheet of pure metal. Given its fragile nature, some foils have protective coatings.