Cladding is a series of chemical reactions between the surface of ancient coins and other substances in the air for hundreds of years. Silver dollar patina is very special and varied in color. Some silver dollar surfaces will turn dark gray, some silver dollar patina is pure black, and some silver dollar patina is golden yellow. The causes of multicolored patina are more complicated.
Please remember the following points:
(1) Try not to touch the surface directly with your hands, because sweat stains on your hands will pollute the surface of silver coins. It's best to seal the silver coin with sealing plastic, which is more convenient to watch and can prevent the dust in the air from polluting the surface of the silver coin. Try not to collide, because it is easy to leave traces when colliding with each other.
(2) If the silver coin is dirty, put it in warm soapy water for slight cleaning, then rinse it with clear water and gently dry it with a soft cloth, and finally put it in a dry and ventilated place; Try not to rinse with weak alkaline water or brush with a brush.
(3) The color-changing silica gel should be placed in the place where silver coins are stored, which mainly plays the role of moisture absorption; Silica gel is blue when it is dry and turns red when it absorbs water. It's best to put it in an anti-corrosion and moisture-proof safe.