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As you see the picture above, it shows you the faded color of the stone.  Its color was originally bluish/gray.  It became dull gray over the long time.  It seems to have be affected by weathering.  The second picture on right shows the two panels.  Comparing both panels, the second panel on right looks more damaged than other first panel on left.  The second panel have been weathered by snowing.  Snow is the form of crystalline water ice.  Probably the snow caused the frosting to whiten up the monument.  The panel might be stained by dirt and snow.  Assumed that the person who worked at Mt. Hope cemetery was too late to clean the stain off the stone, because the stain was left there for a long time.  It might be the best not to attempt to brush salt crystal from snow.  There is no sign of degradation such as frost expanding or frost crackling. Why is zinc the choice for the monument?  In general, metals do corrode easily.  Zinc is the simple answer is to stop the corrosion of metals many metals As zincs deteriorate, they build up a coating that renders them less effective. This is why it is recommended to replace zincs when they are half deteriorated. Zinc has a zinc oxide coating that protects from the air and the weathering.  It is much better aging and weathering than other materials such as limestone and marble.  However, it might be damaged by acid rain. According to Mt. Hope saying that "due to its brittleness, breakage and seam separation are the most common damages to these monuments followed by corrosion and 'creep.'  Repair work for these problems requires professional conservators and is very expensive".  The creep is when the Also, the way it looks along white bronze painted in zinc is appealing the visitors who visits the cemetery.  It is evaluated as a good condition, as long as it is still stand tall.

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The Conservation of American War Memorials Made of Zinc
Carol A. Grissom and Ronald S. Harvey
Journal of the American Institute for Conservation
Vol. 42, No. 1, Architecture Issue (Spring, 2003), pp. 21-38
Published by: The American Institute for Conservation of Historic & Artistic Works
Article Stable URL: http://www.jstor.org/stable/3180054^{Image Removed}