| http://www.w3.org/ns/prov#value | - Thus, the colour-generating metal film can be connected as an anode in an electrolyte normally used in anodizing, e.g. an organic acid, such as citric acid, oxalic acid and solutions of salts such as ammonium sulphate, ammonium pentaborate, ammonium tartrate and other acids such as boric acid, phosphoric acid, etc.
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