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Chromo-sulfuric acid > Detergents

Today there is no need to use chromo-sulfuric acid any more since there are a lot of suitable detergents available for cleaning purposes where the succesful cleaning may still be enhanced by treating in an ultrasonic bath. Another easy alternative is a freshly prepared mixture of sulfuric acid and hydrogen peroxide. However, on cleaning of glass frits vigorous reactions have been reported. Therefore use this mixture carefully.