| http://www.w3.org/ns/prov#value | - (3) There is formed in the electrochromic material, in the zone of contact with the electrode, a mark which is immediately and directly visible by cathodic reduction of at least one depositable metallic ion and is present in the material, and at least one metal which electrocrystallizes and is an integral part of the material, the metal constituting the mark.
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