It is a new one on me or I don't remember it, but a semiglossy grey substance not in balls but irregular elongated chunks coming in in the pollen baskets. Does this ring a bell for some early spring tree pollen? Or have my bees found a new and exciting form of toxic waste? I saw no other colors of pollen and frankly I didn't expect to find any. Just not time yet here. Thanks for any ideas of source.