The gloss on this low fire red clay is not the product of a glaze or any kind of glass development. It is from a layer of incredibly fine clay on the surface (a process called Terra Sigillata). It is the product of a lengthy research project by Monika. She investigated many materials, techniques, clay bodies and firing schedules.
Terra Sigilatta is a sedimentation process used by potters to remove coarse particles from a clay powder. It enables burnishing and gloss surfaces without the use of glaze.