(a) In order to allow for variations incident to commercial grading and handling, any lot of onions may, as limited by this section, contain onions that do not meet the grade requirements for the lot’s grade.
(b) In any lot of Grade No. 1, Grade No. 1, Large, or Boiler Grade onions, not more than six percent by weight may fail to meet the grade requirements.

(c) In any lot of Grade No. 1, Grade No. 1, Large, or Boiler Grade yellow onions, not more than five percent by weight may be noticeably pink.
(d) In any lot of Grade No. 2, Grade No. 2, Large, or Grade No. 3 onions, not more than 10 percent by weight may fail to meet the grade requirements.