In 2015 we did a project comparing common cone 6 fluid-melt base glazes, picked a favourite (Panama Blue) and fixed it's slurry issues and crazing
. Fluid-melts almost run off ware when applied thick, but they host stains & opacifiers to produce super-gloss, super-brights. That recipe, G3806C
, has been among the most popular pages on our site. In 2019 we moved the thermal expansion
much lower (from 7.3 to an incredible 5.7, it can survive a 325F-to-icewater test on our toughest-to-fit porcelain). The best variation, G3806N, is fluidity-controllable (by adjusting kaolin content), durable (double the Al2O3/SiO2 of other common ones) and employs lithium, strontium and magnesia frits
. This version, G3806E, has 4% added copper oxide and sources SrO, Li2O and MgO from strontium carbonate, spodumene and Frit
3249. Follow the link here to see the entire history of this development effort (beware, there are multiple pages, each with many columns).