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Silver: reactions of elements. Reaction of silver with air. Silver metal is stable in clean air under normal conditions. Reaction of silver with water. Silver does not react with clean water. Reaction of silver with the halogens. The thermally stable silver difluoride, silver(II) difluoride, AgF2, is formed in the reaction of silver metal and fluorine, F2. Reaction of silver with acids. Silver metal dissolves in hot concentrated sulphuric acid.
Silver nitrate reacts with salt to produce a dark colored residue. Since salt is often part of the latent print residue, this reaction allows yet another way of development or enhancement of prints. It must follow ninhydrin if sequential enhancements will be applied. If salt is present in the substrate, the entire object will darken. Silver nitrate reacts with light to darken also.