Ok, so this week (Wednesday?) I made a batch of sauerkraut. I followed the recipe in NT exactly (with whey), but I found I couldn't get enough juices to cover the vegetation, so I made a 'salt brine' to cover and put a bag filled with water to hold everything down while keeping the water above; per Sally's suggestion. I set it in the canning area down in the basement. It's a bit cold, and dark, and dry. I forgot about it until today, so I checked on it and there is mold along the top.
The jar was clean, right from the dishwasher. What do you think went wrong? Is it salvageable? I have mold allergies so I'm a bit reluctant and a little pissed.