I bought a couple packs of Nattou (fermented soybeans) and stored it in my refrigerator.
They come sealed in plastic, so I opened the plastic and only ate about half of one container. I wrapped it back up in plastic and stored it in the fridge again, and the next day I checked the Nattou and it was covered in tiny white dots, which look kind of foreboding.
It did not look like mold, though, since the white dots were uniformly the same size and spread out evenly. In my experience fungi usually grows at random, and in different sizes, and usually larger than the tiny white dots that I see on the nattou.
What are those dots and is it still edible?
I threw it away without trying it to be on the safe side, but I did notice this experiment is repeatable (I got white dots on the next package by doing the same thing the next day).
I think it might have something to do with storing it in the fridge, since I have stored Nattou in the freezer before without the white dot results.