Its all white and fuzzy. They are old bags that have been outside. I livein the nw so its been 30-50 degrees lately with rain. Im hoping I can reuse this soil. I have done a few compost teas using this soil when it had plants in it. I brushed away half the bag to show contrast. It was white over the whole top layer and about an inch deep. I have 12 of these 5 gal bags full of nice organic mix and most of them have the same thing.