Thanks Ben, I'll send you a pm.
I've only got them in naked Stainless Steel I'm afraid.
They would chemically blacken okay I imagine, but I think you would find that uneconomical to do just one unless you have a bucketful of other bits to do. I believe you can get chemical blackening kits, but not sure for Stainless?
All I can suggest is a blast of Hammerite, but I suspect that it will be prone to chipping and leaving bright spots since if it's doing its job, it will be taking knocks from stones and chippings.
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