If carbon dioxide, solid (dry ice) is used, the packaging shall be designed and constructed to permit the release of carbon dioxide gas to prevent a build-up of pressure that could rupture the packagings and the package (the outer packaging or the overpack) shall be marked with the words &quot; CARBON DIOXIDE, SOLID, AS COOLANT &quot; or &quot; DRY ICE, AS COOLANT &quot; .
If carbon dioxide, solid (dry ice) is used, the packaging shall be designed and constructed to permit the release of carbon dioxide gas to prevent a build-up of pressure that could rupture the packagings and the package (the outer packaging or the overpack) shall be marked with the words &quot; CARBON DIOXIDE, SOLID, AS COOLANT &quot; or &quot; DRY ICE, AS COOLANT &quot; .