Glassline Pens are a lining and shading material for glass. They are simple in design, easy to use and may be thinned with water. A metal tip set is recommended for fine line drawing on glass. The tip set consists of one each of the following size tips: bold, medium, and fine. These tips are placed on the end of the applicator bottle to achieve a variety of line widths. Glassline may be applied between multiple layers of glass or on the top surface for a complex dimensional look. To further explore your creative edge, Glassline may be sprayed to achieve subtle shading variations. Glassline is compatible with most types of glass from float to 90 and 96 COE. For best results ?tack fuse? individual sheets of glass before stacking your full fuse. While best fired to 1500?F., it may be fired lower or higher depending upon your desired results. Available in twenty three vibrant colors. Glassline paints are lead free and food safe.