Ammonium thiosulfate

1. Ammonium thiosulfate can react with unreacted silver halide to form a soluble complex, which can be washed off from the film or photographic paper, thereby stabilizing the image

2. It simultaneously provides nitrogen (in the form of ammonium nitrogen) and sulfur, two essential medium-level nutrients for plants. In the soil, it oxidizes, causing a slight acidification effect, adjusting the soil pH value, and aiding in the improvement of alkaline soil. It can help dissolve trace elements in the soil, enhancing their availability, and has a certain inhibitory effect on certain pathogenic bacteria in the soil