For silver more

Silver solutions used in photography pose an environmental threat if disposed off through
the drainage system. Therefore,
silver is generally recovered for reuse. Electrolysis, the traditional method of recycling silver, salvages only 80 per cent of it. Now, Bruno Pollet of Coventry University in
the UK claims that 95 per cent of
the silver can be recovered by employing ultrasound in electrolysis. Ultrasound denotes very
high pitched sound waves that
are beyond the audible range
of human ears. Reportedly, by enhancing the chemical process
in electrolysis, ultrasound can reclaim a variety of other metals
like zinc, cadmium and lead used
by industries.