I handled our bee club group package buy this last year so now I'm fielding all the newbee "What happened to my bees?" questions. I was sent this picture this morning. Mite frass? Crystallized syrup? Beats me.
https://www.dropbox.com/s/muc9fgjs7c60nvm/photo.JPG
https://www.dropbox.com/s/muc9fgjs7c60nvm/photo.JPG