It is usually alloyed with at least one other metal. The alloying metals not only dilute the silver content to make it more economical, but enhance its physical properties as well. This forms a strong joint in copper pipes, one which is less likely to corrode and leak, and also stands much higher pressure. Photographic film consists of a dispersion of fine silver bromide crystals in an emulsion that is coated on a plastic sheet. Yellowish crystals of silver iodide, AgI, can be sprinkled into moisture-bearing clouds to encourage precipitation.
Silver iodide is harmless to animal and vegetable life.