51.1818—U.S. No. 2 Russet.
               		
               	 	
               	 	
               	 	               	 	               	 	               	 	               	 	
               	 	
    
         The requirements for this grade are the same as for U.S. No. 2 except that at least 10 percent of the fruit shall have more than one-half of their surface, in the aggregate, affected by any  type of discoloration. For tolerances see  § 51.1820.