2SnS2 + 3NH4HS + 3(NH3•H2O) → (NH4)2[SnS3] + (NH4)2[SnS4] + 3H2O
Tin(IV) sulfide react with ammonium hydrosulfide and ammonium hydroxide to produce ammonium trithiostannate(IV), ammonium tetrathiostannate(IV) and water. Ammonium hydrosulfide - concentrated solution.