I tried out a new spool of thread yesterday. it was a robinson anton 40 weight and the colour was metallic black. it was very shiny, but did not look the same as say the tinsel look of typical metallic thread. i was ready for trouble. surprise, it stitched perfectly and all i did was slow the machine down a tiny bit and back off the tension a tiny bit. no needle change. just thought i'd share this because it's the right time of year for sparkly threads.