The metal is silvery white and at red heat slowly changes in air to the resquioxide. At higher temperatures it converts back to the element. Rhodium has a higher melting point and lower density than platinum. It is highly reflective, hard, and durable.
Melting point: 1964 °C Boiling point: 3695 °C
A foil is a thin sheet of pure metal. Given its fragile nature, some foils have protective coatings.