I'm unexperienced with metallic threads in embroidery. I haven't embroidered for a while. I do have some needles that say they are for use with several different types of thread/floss, metallics being one of them.
You can look at my online store, if you'd like. I scanned front and back of most packs, so you can see the info on which type of metallic it says. Web addy is at bottom with my sig.