I wanted a sourdough starter jar that wasn't plastic, so here it is. It's made from Manzano Red ^04. This type of lid will be good with sourdough. Once the starter gets going, it creates a lot of gas and will explode a glass jar with a lid screwed on. This lid is tight enough to keep the starter moist, but loose enough for the gas to escpe.
Manzano Red ^04. It needs a bit more drying before it can be bisque fired.