Oxidized brass chains

Hello everyone! I love the look of oxidized then tumbled brass and copper chain, but obviously it’s a problem for skin. I’m wondering if there is a plating technique (or something else) that can give you that look but doesn’t interact with skin? I’ve tried dips/sprays in Protectaclear but it just doesn’t work in my experience. I’ve inquired with Garlan (my go-to for base metal and plated chains) and they didn’t have any suggestions. Does anyone have tips for other processes?