Silver nitrate (AgNO$_3$) reacts with iron (Fe) to form iron(II) nitrate [Fe(NO$_3$)$_2$] and silver metal (Ag). This reaction can be observed as a brown or black precipitate forming in the solution. The reaction can be represented by the following equation:

2AgNO$_3$ + Fe → Fe(NO$_3$)$_2$ + 2Ag

Since this reaction occurs, it is not advisable to store silver nitrate solution in an iron glass, as the iron will react with the silver nitrate and contaminate the solution. It is preferable to store silver nitrate solution in a glass container made of a material that does not react with it, such as borosilicate glass.