I plastidipped my old Denvers with Plastidip "Gunmetal". I then added "Glossifier" and it gave a really nice shine to it. Overall the outcome was a little more bluey than your typical Gunmetal colour, but refer to the new owner "kam" for photos.
If you can't find charcoal, you can ask (pretty sure) companies like Caswell Australia if they can mix up a colour for you.
They have been great each time I've purchased from them.
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