Until 1987, Jack Daniel's black label was historically produced at 90 U.S. proof (45% alcohol by volume). The lower-end green label product was 80 proof. However, starting in 1987, the other label variations also were reduced in proof. This began with black label being initially reduced to 86 proof. Both the black and green label expressions are made from the same ingredients; the difference is determined by professional tasters, who decide which of the batches would be sold under the "premium" black label, with the rest being sold as "standard" green label.