Conservation and restoration of metals is the activity devoted to the protection and preservation of historical (religious, artistic, technical and ethnographic) and archaeological objects made partly or entirely of metal. In it are included all activities aimed at preventing or slowing deterioration of items, as well as improving accessibility and readability of the objects of cultural heritage. Despite the fact that metals are generally considered as relatively permanent and stable materials, in contact with the environment they deteriorate gradually, some faster and some much slower. This applies especially to archaeological finds. Metals and the agents of deterioration An essential cause of deterioration is corrosion of metal objects or object deterioration by interaction with the environment. As the most influential factors of deterioration of historical objects should be pointed out as the relative humidity and air pollution while in archaeological objects a crucial role has composition, depth, humidity and amount of gasses in the soil. In cases of marine or fresh water finds the most important factors of decay are the amount and composition of soluble salts, water depth, amount of dissolved gases, the direction of water currents and the role of both microscopic and macroscopic living organisms. Deterioration of materials associated with metals Associated materials deteriorate depending on the origin whether they are organic or inorganic materials. Organic materials usually fail in a relatively short period of time, primarily due to biodegradation. With inorganic materials are these processes considerably longer and more complex. Amount of gases, humidity, depth and composition of soil are very important. In case of salty and sweet water finds essential are amount of gases dissolved in water, depth of water, direction of currents, and microscopic and macroscopic living organisms. Agents of Deterioration Physical Force Physical force is one of the most common means of damage to metal objects, which “are considered to be strong and resilient though exhibit weakness and brittleness under certain conditions.” This includes breakage, dents, and scratches which occur in accidents, improper storage and mounting, mishandling, and over-polishing. Fire Low melting point alloys, such as pewter or lead-tin, are at risk of damage due to fire, though other metals are not at risk from the fire itself, but the pollutants caused by smoke. Water Contact with water, or a complete immersion in water, will lead to some degree of corrosion. The more oxygenated the water is, or the higher quantity of salt present