“U.S. No. 2” consists of oranges which meet the following requirements:
    
    
    
    
        
        (i) 
         Not more than one-half of the surface, in the aggregate, may be affected by discoloration. (See  § 51.700.)
     
    
    
    
        
        (4) 
         Similar varietal characteristics;
     
    
        
        (5) 
         Reasonably well colored;
     
    
        
        (6) 
         Not more than slightly misshapen, and,
     
    
        
        (7) 
         Not more than slightly rough.
     
    
    
    
    
    
    
    
        
        (c) 
         Not seriously damaged by any other cause.
     
    
        
        (d) 
         For tolerances see  § 51.689.