In the molten state, silver can dissolve up to 22 times its volume of oxygen; on solidification, most of the oxygen is expelled, a phenomenon known as the spitting of silver.

a)When silver nitrate comes in contact with skin, it is reduced to white color metallic silver.In most cases, a black stain appears due to formation of finely divided silver which has black color.

The black color is due to the decomposition of the Ag+ ion into Ag, silver. Silver nitrate will slowly decompose with the silver ion reverting to elemental silver. The microscopic particles of silver are so small that they absorb light instead of reflecting it, and so appear black, instead of silver....

Silver nitrate is called lunar caustic because when it comes in contact with organic substances (e.g., skin , clothes) and reduced to metallic silver which is white like the iron lunar.

Silver Nitrate is a salt, which is colorless or of a white crystalline form. When this is exposed to light or any organic material, this becomes black in color. Silver Nitrate when heated decomposes and forms, Silver, Nitrogen dioxide and Oxygen.

2 AgNO3 2 Ag + 2 NO2 + O2