The contents of a package containing explosives shall be plainly marked on the outside of the package at the time the package is delivered for transportation.
It is unlawful for any person to deliver, or cause to be delivered, to any carrier for transportation any explosive under any false or deceptive marking, description, invoice, shipping order, or other declaration.
Source:
Section 12088, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=§ionNum=12088..