The normal oxide film can be thickened by heat treatment or anodising, giving permanent colours ranging from blue and mauve to cream and straw. Control is necessary to ensure the absence of colour variations
within a project. Surface finishes range from reflective bright to soft matte and embossed, as used on the Glasgow Science Centre buildings (Fig. 5.30). In this case, the rolling grain direction was maintained over the building facades to ensure no visible variation of the embossed stipple effect.
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