How enzymes are used in processing photographic films?

silver It's used in the form of silver compounds (e.g. silver chloride, silver iodide, silver bromide).

Photographic film tends to contain silver halide compounds, rather than elements.

silver!!

Nitric acidANsw2. Well, Superphosphate fertilizer is made by reacting rock phosphate with sulphuric acid. But both nitrates and ammonia are used by plants as fertilizers as a source of nitrogen.

silver