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Anodizing of aluminium and its alloys. Visual determination of image clarity of anodic oxidation coatings. Chart scale method Ingestion-build-109673 BS EN 50125-1 assists in1 Scope This document specifies a visual method for determining the image clarity of anodic oxidation coatings on aluminium and its alloys, using a chart scale and a lightness scale, which are defined. The method is applicable only to flat surfaces that can reflect the image of the chart scale pattern.