Pulled the covers off my bucket seats to replace and found this mess in the seat back of one of them. My first thought was someone dumped a container of graphite powder in it. But as I got it loose I realized it must be powdery black mold. It was literally pooled up like loose powder at the base under the cover. Put on a mask and pulled the whole mess into a garbage bag to separate it from the frame and then vacuumed the cover and up all around the floor and work table. Most of the black area on the foam had a layer of muslin placed over it so this must have started before the last guy replaced the cover. But the seat bottom was fine. I was considering putting the fronts up for sale as they were in good shape and older Legendary covers but may just chunk them now. It’s amazing what some people will do to save a buck.