On dark burning medium temperature stoneware bodies, clear glazes often do not look good. These bodies contain more raw clays that contain larger particles that generate gases on decomposition during firing. These often cloud up typical clear glazes with micro bubbles, marring their appearance. There are solutions. Although more fluid-melt clear glazes have risks (e.g. running, blistering) they do clear bubbles better. If applied thinly (so they do not run during firing) they can work very well in this circumstance. Of course they do darken the body color (this body, Plainsman M390, fires red without glaze). This outside glaze is G3806C.
Pages that reference this post in the Digitalfire Reference Database:
G3806C - Cone 6 Clear Fluid-Melt Clear Base Glaze, Red burning clays bubble glazes more, Two transparent glazes on the same dark burning clay. Why different?, Insight-Live Project to develop a cone 6 fluid non-crazing clear glaze, Transparent Glazes, Melt Fluidity
This post is one of thousands found in the Digitalfire Reference Database. Most are part of a timeline maintained by Tony Hansen. You can search that timeline on the home page of digitalfire.com.