Wash. Admin. Code § 246-243-042
(1) The licensee may not use a source changer or a container to store licensed material unless the source changer or the storage container has securely attached to it a durable, legible, and clearly visible label bearing the standard trefoil radiation caution symbol in conventional colors, that is, magenta, purple or black on a yellow background, having a minimum diameter of 25 mm, and the wording:
caution (or "danger")
radioactive material
notify civil authorities if found
(or "name of company")
[Statutory Authority: RCW 70.98.050 and 70.98.110. WSR 16-13-054, § 246-243-042, filed 6/10/16, effective 7/11/16. Statutory Authority: RCW 70.98.050. WSR 00-08-013, § 246-243-042, filed 3/24/00, effective 4/24/00.]