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Anodizing aluminium + copper look temperature influences

We are a anodizing manufacturer and recently we have been successful in anodizing aluminum while adding a copper film inside the pores. Visually the aluminium looks like copper. Our problem is that once we heat up the material above 200C - the color color becomes very pale. Its not comparable with the original achieved color. We are looking for the answer how we can keep the color fixed even if we heat it up to 250C.

Jan Helskens
- Desselgem, Belgium
2007

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