Chromium-free etchant for plastic surfaces

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A pickling solution comprises a source of Mn(VII) ions; and an inorganic acid, where the pickling solution is free of chromium (VI) ions, alkali ions, and alkaline-earth ions. An independent claim is included for pickling acrylonitrile butadiene styrene plastic surfaces involving contacting the plastic surface to be pickled with an acidic treatment solution comprising Mn(VII) ions and is free of alkali and alkaline earth ions.