Objects recovered from a maritime environment will require different cleaning techniques in order to keep or remove a patina layer, as well as removing enough of the salts that have penetrated the inner layers of the object. This must be done carefully because multiple cleanings actually strip away the silver and over cleaning might severely damage the silver layer ( Long, 1999). In many instances, silver may be a plating on top of an alloyed base layer of metal and by polishing the silver layer, the patina may be removed. A patina layer on silver objects, however, may need to be removed in order to display the value of the silver, but this must be done carefully. This is due to weather conditions and the aging process of metal itself, depending on the environment and the resulting color may provide a pleasing look. The formation of patina on copper or bronze objects is a result of the natural process of oxidation of the metal. The color that has now replaced the original color of the metal may, depending on the individual, be more desirable and pleasing to the eye. It will cover the original layer of metal and depending on the metal type, will exhibit different colors. Patina will cover an object in a fine layer and could be considered to have film like qualities to the touch and appearance. It is a form of corrosion that can have deleterious effects on these objects but also can enhance aesthetics of the objects. Patina will be found mostly on metal objects, especially those made of copper, brass and silver. Can be green or black in color on certain metals like copper and bronze ( Merriam-Webster online, 2013). Used with regard to a surface layer on metal caused by oxidation or corrosion ( Art and Architecture online, 2004). Patina (Noun): An aged appearance caused by environmental factors, either acquired naturally or artificially induced.
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