A weird thing has happened with one of my sauerkrauts.
As an experiment I left one batch out way longer than the others that I put in the fridge. After about 5-6 weeks, the top bit of cabbage started turning a weird grey colour. This weird grey colour gradually leeched downward to about the top two inches of kraut and darkened.
We just opened it after about 9 weeks and it smelled kind of fine. We discarded all the grey and my husband gave it a taste and said it was lovely! So we’re keeping it, but I’m still curious what happened! Any ideas?