Wares were made from about 1750 onward by mingling manganese with a dark-firing clay, producing a black body, some of which were gilded. The gilding on the gilded pieces was often worn away from use. This ware was made in Jackfield in Shropshire.
Some of the pieces had applied relief in much the same manner as the Astbury ware and many of those pieces were gilded as well.
It wasn't unusual to find tea wares of all kinds in this medium.