it’s not sealed, the lids have vents in them, so no blowing up.
See the liquid above the regular kraut, notice that it’s black? Well I decided that black salt must have some mac-daddy minerals in it, so that batch is half punk and half black salt. It wasn’t until I saw the color that I looked it up and learned that black salt is just salt tumbled with activated carbon. It is slowly settling out, and won’t have any real taste, but looks stupid.
I know the ferment is going well because my wife asked if I would find where the dog took a dump.