I've been using simple Mason jars to ferment cabbage until now using the original cap. That meant burping the jars or caps bent out of shape but which also kept the smell from embalming the whole house. The latter I did not notice actually until I started using the silicone caps that make the jar look like a nursing bottle. https://www.amazon.ca/gp/product/B07WFG ... UTF8&psc=1
While investigating its source we noticed something quite interesting, that the smell changes from quite pleasant, although unlike anything we ever encountered, when we put our noses next to the nipple to frankly fecal just a few inches away!
I am curious as to how that transformation comes about. Is it simple oxydation or bacterial activity near the tip of the jar?
Bad smell is a minor problem for us but potentially not for visitors. Which fermentation caps should we use to avoid it?
Thank you for your time.
Jean