in the water, will cause a more rapid and aggressive corrosion to metal. Short term exposure to water "can result in rapid surface corrosion, such as when flash rusting occurs on iron or steel objects that have been even momentarily wetted." Iron and steel are most affected by water. Pollutants Atmospheric pollutants are one of the more common agents of deterioration for metals, with tin and tin alloys most affected and resulting in corrosion. Most common pollutants include dirt, soot, dust, and chemicals. Fingerprints, salts, fatty acids, and polish residues can also cause corrosion. Incorrect Temperature and Relative Humidity Higher temperatures increase the rate of chemical reactions and corrosion. Temperature also affects relative humidity, thus should be monitored and controlled. The higher the relative humidity (65% and above), the higher the risk of corrosion. Lead is the least affected by high humidity. Metals conservation planning As with the conservation and restoration works on any other material, here are the basic tenets of conservation-restoration based on the quality of execution and the best possible preservation of cultural, historical and technological identity and integrity of objects. Minimal intervention, reversibility and repeatability of preferred treatment are essential, as well as the possibility of easy identification of restored parts. Recently, the non-toxic nature of materials and procedures used in conservation has become important too, both in relation to objects and conservator-restorer as a performer, but also in relation to the environment. Research Nowadays, scientific research is an integral part of conservation treatment of metals, in which different scientific methods and techniques help in determining what should be done in the preservation and care of the object. Conservators investigate the materials and techniques used in the creation of an object to better understand and diagnose an object's condition and make plans for effective treatment. Identification of metals and alloys Simple methods - visual examination, spot tests, specific gravity Scientific methods - X-ray fluorescence, X-ray Diffraction (XRD), Particle-induced X-ray emission, LIBS, SEM, electrochemical techniques, metallography Identification of corrosion processes and products Simple method - visual examination, spot tests The Oddy test - for copper, silver, and lead Scientific methods - X-ray Diffraction, SEM, metallography Identification of materials associated with metals Simple methods - visual examination, spot tests, specific gravity Scientific methods - X-ray fluorescence, chromatography, Raman spectroscopy Identification of technology used to produce objects Simple methods - visual examination Scientific methods - metallography, x-ray radiography, x-ray