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surface discoloration of a metal caused by formation of a thin film of corrosion products (compare: scale), metallpinna värvimuutus mille on põhjustanud õhukese korrosiooniproduktidest kile moodustumine (vrd tagi), изменение цвета металла, вызванное образованием тонкого слоя продуктов коррозии (ср. окалина)
потускнение . Materjalitehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mtr/%D0%BF%D0%BE%D1%82%D1%83%D1%81%D0%BA%D0%BD%D0%B5%D0%BD%D0%B8%D0%B5/1/rus (04.10.2026)