The Press Herald Food & Dining section has published an article on syrup grading,
Take that darker syrup, which in Maine is called Grade A Extra Dark Amber. In Vermont and New Hampshire, that same syrup would be labeled Grade B. In New York, the label might read “Extra Dark for Cooking.” And in Canada, it’s called “No. 2 Amber.”
The 1983 Maine Maple Sunday was the first-in-the-nation event. A dozen Maine producers hosted open houses. “Come and see Maine maple syrup made,” they broadcast. Entertainment featured syrup making, sleigh rides, sap collecting tours, syrup tasting, pancake breakfasts, maple sundaes, and syrup selling. Acceptance by the public was unexpectedly high. Maple Hill Farm in Farmington counted 1500 visitors.