A thin layer of silver is applied to objects such as glass. To place Tollens' reagent in a glass, add Glucose/Dextrose, and shake the bottle to promote the reaction.
AgNO3+KOH→AgOH+KNO3
AgOH+2NH3→[Ag(NH3)2]++[OH]− (Note: see Tollens' reagent)
[Ag(NH3)2]++[OH]−+aldehyde (usually glucose/dextrose) →Ag+2NH3+H2O