Internal defects are defects which cannot be detected without cutting the potato. Some internal defects are listed in Table VII.
Table VII--Internal Defects------------------------------------------------------------------------
Damage Maximum Serious Damage
Defects Allowed Maximum Allowed------------------------------------------------------------------------
Occurring outside of or not entirely confined to the vascular ring------------------------------------------------------------------------Ingrown Sprouts, Internal 5 percent waste..... 10 percent waste.
Discoloration, Vascular
Browning, Fusarium Wilt,
Net Necrosis, Other
Necrosis, Stem End Browning.------------------------------------------------------------------------Internal Black Spot......... When the spot(s) are When the spot(s) are
darker than the darker than the
official color chip official color chip
(POT-CC-2) after (POT-CC-2) after
removing 5 percent removing 10 percent
of the total weight of the total weight
of the potato. of the potato.------------------------------------------------------------------------
Occurring entirely within the vascular ring------------------------------------------------------------------------Hollow Heart or Hollow Heart Area affected not to Area affected not to
with Discoloration. exceed that of a exceed that of a
circle \1/2\ inch circle \3/4\ inch
in diameter in a in diameter in a
potato 2\1/2\- potato 2\1/2\-
inches in diameter inches in diameter
or 6 ounces in or 6 ounces in
weight. \1\ weight.\1\------------------------------------------------------------------------Light Brown Discoloration Area affected not to Area affected not to
(Brown Center). exceed that of a exceed that of a
circle \1/2\ inch circle \3/4\ inch
in diameter in a in diameter in a
potato 2\1/2\ potato 2\1/2\
inches in diameter inches in diameter
or 6 ounces in or 6 ounces in
weight.\1\ weight.\1\------------------------------------------------------------------------
Occurring entirely within the vascular ring------------------------------------------------------------------------Internal Brown Spot and Not more than the Not more than the
Similar Discoloration (Heat equivalent of 3 equivalent of 6
Necrosis). scattered spots \1/ scattered spots \1/
8\ inch in diameter 8\ inch in diameter
in a potato 2\1/2\- in a potato 2\1/2\-
inches in diameter inches in diameter
or 6 ounces in or 6 ounces in
weight.\1\ weight.\1\------------------------------------------------------------------------\1\Note: Correspondingly lesser or greater areas in smaller or larger
potatoes. [35 FR 18258, Dec. 1, 1970. Redesignated at 42 FR 32514, June 27, 1977, and further redesignated at 46 FR 63203, Dec. 31, 1981; amended at 56 FR 7553, Feb. 25, 1991; 56 FR 10302, Mar. 11, 1991; 73 FR 15058, Mar. 21, 2008 ; 73 FR 70586, Nov. 21, 2008; 76 FR 31789, June 2, 2011]
Metric Conversion Table