You have me thinking sideways about something. My husband and I own a small manufacturing company - we make sowing machines (yes I spelled that right - they're for greenhouses). Our machines are mostly aluminum with black. For our 10th anniversary my husband is having some of the milled aluminum parts black anodized. I've seen the samples and they're lovely. So yeah - now I'm doing a sideways think about black anodized parts on a sewing machine ... hand wheel perhaps. Will have to ask my husband if it's possible - my knowledge of metallurgy is limited to spelling metallurgy.