2Na3[Au(S2O3)2] + 2(NH3•H2O) + C2H2 → Au2C2 + (NH4)2S2O3 + 2H2O + Na2S2O3
Sodium ditiosulfatoaurate(I) sodium react with ammonium hydroxide and acetylene to produce gold carbide, ammonium tiosulfate, water and sodium thiosulfate. Ammonium hydroxide - concentrated solution.