Photography halogens

The only liquid nonmetal does full justice to its name and to its group (the halogens) it stinks and is aggressive. Bromine compounds capture radicals hence the application as flame retardant. Is a component of the previously widespread sleeping agent "Bromural" as a consequence the element became popular (bromine calms). Its most important role is as a silver salt in photography. It is present in small amounts in our bodies (ca. 250 mg), but its function has still not been established. 

Cadmium(II) bromide Cd + 2Br " —> CdBr. This compound is used in photography, engraving, and lithography. The other halogen elements also combine with cadmium in a similar ionic reaction as with bromine. 

How can you explain the change in the colour of the silver halides with an increase in the atomic number of the halogen Compare the solubility products of silver halides and sulphide (see Appendix 1, Table 12). What anion is the most sensitive reagent for the silver ion What is the significance of silver halides in photography What substances are used in developing photographs ... 

Although the primary photochemical process of photography is quite simple [it is an electron transfer from X (X = halogen) to Ag+ within a microcrystal of AgX], the technology of photographic emulsions and of their treatments after irradiation is complex. 

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