This year I have 2 students in my room that both have severe nut allergies. I have had to re-train myself to look at the labels for EVERYTHING, monitor who sits by who during lunch, wash hands religiously before and after eating, and wipe tables like a mad women after snack. I'd love to share some signs with you that I made to help make others aware when they enter my room. I have this hanging right by my classroom entrance.
I made 4 different versions in case you can use it too!