Regarding yesterday’s piece:
A reader insists we add that Bittul is for tasty, sizable Chametz, as Rava said: גזרה שמא ימצא גלוסקא יפה ודעתיה עילויה, yet the “Mechira” contract now includes any and every crumb of chametz or chametz derabbanan or Ta’aroves chametz (or even Taam chametz!) in one’s possession.