Chamber blade for use in a printing machine, for example a flexo printing machine, the chamber blade having a face with a U-shaped channel, the chamber blade being of metal and comprising a surface coating produced by a plasma electrolytic oxidation (PEO) where the surface coating at least covers the U -shaped channel which allows metal to be used to make chamber racks without the risk of decomposition, either due to chemical influences from the colors / varnishes / primers used or as a result of the coating being destroyed by cleaning fluids. The invention further relates to a method of treating the surface of a chamber blade and to use a chamber blade.
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