I mean you can just run gold t-shirt foil through a plotter and get pretty much that exact effect. It’d still be a massive pain in the arse to get the waste removed and the pattern applied, but nothing that’s outside the realm of capability for cosplayers.
It’s great for keeping rust off tools. Just the slightest whiff of vaseline will keep rust away for years. I tend to use a spray can of vaseline for that though, not a tub.