We prepared a solution using silver nitrate, chitosan, and sodium tripolyphosphate to synthesize silver chitosan nanoparticles. This solution was subjected to cold atmospheric pressure plasma for 10-15 minutes, and we observed a change in color from transparent to yellow or brown, depending on the concentration of the solution. However, after one day, the color of the solution containing nanoparticles reverted to transparent. Is there any reason behind this?