These lead-free paints are opal (not transparent) and suitable for high temperatures. They are used for fusing, screen printing, airbrushing, hand painting, etc. You can use the fusing glass paint on-top, but it can also be enclosed between 2 layers of glass.
The firing temperature is 700-850 °Celsius. (1292 -1562° F)  
Please note: the BP numbers require oxygen and are therefore not suitable for embedding.