Test on stand ring, round with one ear, red pottery, test stove heating floor found ceramic earthenware glaze lead glaze, ring 7.8 hand-turned glazed baked Round test on stand ring Internally glazed Standing ear scalloped adhering to the edge. Red shard of free thick-walled earthenware. Narrowing over the foot archeology City Triangle Rotterdam Laurenskerk indigenous pottery heating lighting Soil discovery found during the restoration of the Laurenskerk in Rotterdam Excavation of chapels north of the tower.