Powder layer versus anodizing was an eye-opener: powder provides abundant structures and color depth

https://research-wiki.win/index.php/The_Truth_in_the_Patina:_Why_Custom_Finials_in_Copper_Are_the_Architect%27s_Time-Tested_Selection

Powder finish versus anodizing was an eye-opener: powder provides rich appearances and color deepness, while plating reveals aluminum's metallic clearness with outstanding UV longevity.