Improved No. 2 grade and Improved No. 2 Bright grade means grapefruit meeting all of the respective requirements of the U.S. No. 2 grade and the U.S. No. 2 Bright grade and those requirements of the U.S. No. 1 grade relating to shape (form) and color, as such requirements are set forth in the U.S. Standards for Grades of Florida Grapefruit (§§ 51.750-51.783 of this title) or as such standards may hereafter be amended.