the.com/stoneware
Clay fired so hot it forgets how to be fragile.
means Dense, durable pottery baked at high temperatures until it turns waterproof without any glaze.
from Plain English compound, traced to the 1680s: literally ware made hard as stone, a craftsman's honest brag.
Firing heatVitrifies around 1200 Celsius, hot enough to glassify.
No glaze neededWatertight even before its glossy coat goes on.
German rootsRhineland salt-glazed jugs perfected the craft by 1400s.