The body is dark brown burning Plainsman M390 (cone 6). The amber colored glaze is 80% Alberta Slip (raw:calcine mix) with 20% of each frit. The white engobe on the inside of two of the mugs is L3954A (those mugs are glazed inside using transparent G2926B). The Alberta Slip amber gloss glaze produces an ultra-gloss surface of high quality on mugs 2 and 3 (Frit 3249 and 3195). On the outside we see it this glaze on the white slip until midway down, then on the bare red clay. The amber glaze on the first mug (with Frit 3124) has a pebbly surface that is not working nearly as well. These mugs are fired using a drop-and-soak firing schedule. Some caution is required with the 3249 version, it has low thermal expansion (that is good on bodies that normally craze glazes, but risks shivering on ones that do not).
Pages that reference this post in the Digitalfire Reference Database:
Ferro Frit 3249, GA6-A - Alberta Slip Cone 6 Amber Base Glaze, GA6A Alberta Slip base using Frit 3249 and 3195 on buff body, P300 and M370 mugs with GA6A Alberta Slip (using Frit 3249), Alberta Slip Cone 6 Base with Frit 3249, 3195, Plainsman Cone 6 Slow Cool (Reactive glazes)
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.