“U.S. No. 1” consists of tangerines which meet the following requirements:

(a) Basic requirements:

(1) Discoloration: Not more than one-third of the surface, in the aggregate, may be affected by discoloration. (See § 51.1828.);

(2) Fairly well colored;

(3) Firm;

(4) Mature; and,

(5) Well formed.

(b) Free from:

(1) Decay;

(2) Unhealed skin breaks; and,

(3) Wormy fruit.

(c) Free from damage caused by:

(1) Ammoniation;

(2) Bruises;

(3) Buckskin;

(4) Caked melanose;

(5) Creasing;

(6) Dirt or other foreign material;

(7) Disease;

(8) Dryness or mushy condition;

(9) Green spots;

(10) Hail;

(11) Insects;

(12) Oil spots;

(13) Scab;

(14) Scale;

(15) Scars;

(16) Skin breakdown;

(17) Sprayburn;

(18) Sunburn; and

(19) Other means.

(d) For tolerances see § 51.1820.