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You mentioned you anodize small parts at home, I've yet to try it at home but my extender/adapter isn't exactly small, primary thing I want to do.
If you're using black are you using a specific dye?
I've only seen mention of black food colouring online (other than very expensive dyes) being suitable but haven't tried it yet.
It's different to working in the industry over 40 years ago where they had all of the precise chemicals and I no longer remember what was what. Plus they brought a chemist to get chemical mixtures right, I was happy not having to play with cyanide (I ran the zinc tanks but also did anodizing in another tank next to the one with cyanide) for a yellow/gold finish on aluminium products.
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