I am going to fire them at about 10 temperatures starting at cone 022. These will be a great to determine whether they suddenly melt or slowly soften over a range of temperatures. I will be able to see how wide that range is and how they behave as they go beyond it. I also included Gerstley Borate, mother nature's nature boron source. They way it melts should clear contrast with the frits.
Frits are used in ceramic glazes for a wide range of reasons. They are man-made materials of controlled chemistry with many advantages or raw materials.
Ceramic glazes melt and flow according to their chemistry and mineralogy. Observing and measuring the nature and amount of flow is important in understanding them.
Comparing the Melt Fluidity of 16 Frits