There's a lot of you guys out there using glass jars. That's fine for testing but keep in mind that if your jars explode like some have lately, you don't want the glass in your eyes or skin. I recommend that once you learn a little bit, you should migrate to a stronger container. I did attempt to use a large glass container for one of my automobile tests but I quickly switched to something other than glass for my long term containers. The main reason why I switched was not safety. I had trouble building my flat plate arrays through the round neck of the jar. It was like building a ship in a bottle.