AgNO3 is heat sensitive, Do not autoclave it, add it to autoclaved MS media after filtering it with membrane filter. and the stock of AgNO3 should be stored in dark bottle.

Thank you very much for your answer

I suggest you check carefully the concentration of the AgNO3 you are adding to the medium. At very high concentration it will change the color of the medium weather added before or after autoclaving. Recommended concentrations range between 1-10 mg/l. I normally use it at 1.6 mg/l post autoclaving to induce callus from maize tissues.

I am adding silver nitrate in MS media after autoclaving it. But it forms brown precipitates. what could be the possible reason for it and how to avoid this?