Any art object can be damaged by the environment, accident or time. The world is a poorer place when any piece of art is lost through damage. The art world has taken steps over the centuries to repair damages to works of art. In the modern world, technology has come to the aid of these tireless guardians of the world's culture. Chemistry is an important factor for those who work to restore art. They must know the underlying material of many art pieces to create a correct formula for repairing damage. Physics is also used in art restoration. Spectral-analysis brings forth a picture that cannot be seen with the human eyes alone. These scientific specialties help keep art masterpieces from being lost forever.