A blue colouration (in solution or precipitate) is not obtained when :

Silver(I) chloride is created as a white precipitate when the silver cation (Ag+) and chlorine anion (Cl-) combine in the presence of soluble chlorides such hydrochloric acid. In contrast to acids like ${\mathrm{HNO}}_3$, this precipitate dissolves in aqueous ammonia and forms a complex ion as

$\mathrm{AgCl}+{\mathrm{NH}}_3\to \left[\mathrm{Ag}{\left({\mathrm{NH}}_3\right)}_2+{\mathrm{Cl}}^{-}\right.$

Here, blue colouration (in solution or precipitate) is not obtained.