The High Heat China Marker Pencils are a great and affordable alternative to traditional underglaze pencils. Great for creating fabulous patterns and designs on bisque! This brown pencil does not contain underglaze, however, it will not burn off after firing.High Heat China Marker Pencils are super easy to use, and have a variety of uses. They're great for signing large platters for weddings, coaches gifts, teachers gifts, and holidays. You can outline your fabulous patterns and brush strokes, use them to accent or contrast a pattern, and so much more! These pencils also work on a variety of surfaces - glass, plastic, film, bisque, paper, rubber, metal, and more!