Need help identifying strange substance!

[RagingBullPa]

a mere dusting, now in Philadelphia and New York City , there would be traffic jams and accidents, people running to the supermarkets buying up , a cart full of milk , a cart full of eggs and acart full of bread , what for, i do not know, because most of the suburbanites eat out at olive garden or red lobster or old country buffet , crackerbarrel, or the local pizza parlor anyway , can't cook and couldn't boil water without instructions, my one sister-in-law fits that mold, so it has always intrigued me when i see this even in my area before a storm when it is forecasted , i just shake my head and tell some of them hey you forgot the darn toilet paper better fill another cart cause if you eat that much eggs and milk you will need it, along with room deodorizers