Yttrium has a silver-metallic luster and is relatively stable in air. Turnings of the metal, however, ignite in air if their temperature exceeds 400°C. Finely divided yttrium is very unstable in air.
Melting point: 1522 °C Boiling point: 3345 °C
A foil is a thin sheet of pure metal. Given its fragile nature, some foils have protective coatings.
