There are various ways to produce such threads. Most often, a coloured metallic foil is wrapped around a core made, for example, from polyester. But regardless of the manufacturing process, the quality remains a critical criterion when making a choice. Good quality helps during production, as the yarn will not shred on the embroidery machine and the metallic layer won’t split, leaving the core exposed. Additionally, the embroidered or sewn design will have an intense shine that will last. A simple method to test the wrap is by running your fingers down a strand of thread and observing whether the strips of metal are stable or fall off.