I made a lot of glaze test, to understand and learn about all the different aspects and commodities more.
At first, mostly trough a triangle system. Later t define the glaze more and search for technical improvements in the glaze. Test the glaze several times to see if the glaze is stable.
By testing the glaze on different clay and different foreign programs you get very different results.
Glaze Research 1
Glaze Research 2