7 CFR § 51.2281
Color classifications
July 6, 2020
The following classifications are provided to describe the color of any lot:
(a) “Extra light,” “light,” “light amber,” and “amber:” The portions of kernels in the lot shall be not darker than the darkest color permitted in the specified classification as shown on the USDA Walnut Color Chart.
(b) “Red:” There are no color requirements.
[82 FR 39657, Aug. 22, 2017]