Glassline Pen colors are 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. Glassline colors are best fired to 1500 degrees F., but may be fired lower or higher depending upon desired results.

Glassline Pens are used as a lining and shading material for glass. They're simple in design, easy to use, and can be thinned with water. A metal tip set is recommended for fine line drawings on glass. The Tip Set consists of one each of the following size tips; fine, medium, and bold. These tips are placed on the applicator bottle and used to achieve a variety of line widths.

Glassline colors can be applied between multiple layers of glass or on the top surface for a complex dimensional look.

Glassline colors may also be sprayed to achieve subtle, shading variations on glass.