Tinsel and several types of garland or ribbon are commonly used to decorate a Christmas tree. Silvered saran-based tinsel was introduced later. Delicate mold-blown and painted colored glass Christmas ornaments were a specialty of the glass factories in the Thuringian Forest, especially in Lauscha in the late 19th century, and have since become a large industry, complete with famous-name designers. Baubles are another common decoration, consisting of small hollow glass or plastic spheres coated with a thin metallic layer to make them reflective, with a further coating of a thin pigmented polymer in order to provide coloration.