The NT Glass Color Line is a popular choice for kiln-fired glass, known for its vibrant, glossy colors that are non-toxic and food-safe, including metallic. Available in powder form, they can be mixed with UGC Medium at a 1:1 ratio for semi-opaque to opaque results or used dry for stenciling. Suitable for COE 96 glass, they fire at 1425F-1550F and are designed for application on the top layer of glass, though they also work well when capped.