``U.S. No. 1'' consists of portions of walnut kernels which are well dried, clean, free from shell, foreign material, insect injury, decay, rancidity, and free from damage caused by shriveling, mold, discoloration of the meat or other means. (See Sec. 51.2280.)
(a) Color shall be specified in connection with this grade in terms of one of the color classifications. (See Sec. Sec. 51.2276, 51.2281 and 51.2282.)
(b) Size shall be specified in connection with this grade in terms of one of the size classifications. (See Sec. Sec. 51.2284 and 51.2285.)