Wash. Admin. Code § 16-436-190
The following marking requirements apply to all grades except culls.
(1) All containers must be conspicuously and legibly stamped with the:
(3) Minimum size must be stated on the container in terms of:
(5) The grade must be stamped on the container in letters that are at least 1/4 inch high. The following abbreviations may be used:
[Statutory Authority: Chapters 15.17 and 34.05 RCW. WSR 07-12-075, § 16-436-190, filed 6/5/07, effective 7/6/07. Statutory Authority: Chapter 15.17 RCW. WSR 92-11-076, § 16-436-190, filed 5/20/92, effective 6/20/92; WSR 88-11-048 (Order 1977), § 16-436-190, filed 5/16/88; Order 1203, § 16-436-190, filed 5/14/71, effective 6/14/71.]