Rule 13.
CFR · 2024-01-01 · US · Title 7
Degrees of uniformity shall be expressed in terms of percentages. The percentages shall govern the portion of a lot which must meet the specifications of the grade. (These percentages shall not affect limitations established by other rules.) The minor portion must be closely related, but may be of a different group, quality, and color from the major portion.
official document · source cfr-2024 · id 7:§ 29.1119