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eventuali sostanze contaminanti che non possano essere disciolte o distrutte dalla miscela solfo-cromica o dall'acido fosforico, come ad esempio siliconi, vanno eliminate mediante un opportuno solvente organico.
contamination by substances which are not dissolved or destroyed by chromo-sulphuric acid or phosphoric acid, such as silicones, shall be removed by means of a suitable organic solvent.
