Message in a bottle

I promised Chris Luther that I'd upload this as evidence that we in fact made pots in Norfolk and tossed'em in the harbor. This jug lasted about a half an hour. As we observed, the jug was plugged at the mouth, but the bottom gave way first. It opened up and took on a little water. Then to our surprise it righted itself and floated for a little while longer. I've heard of salt glaze, but salt slake? Enjoy.