What color ink is used to stamp or write "Classified Item" on source documents for classified items?

The use of red ink for stamping or writing "Classified Item" on source documents is a standard practice in material management, particularly concerning items that hold national security implications. The color red is specifically chosen for its visibility, which helps to immediately draw attention to the classification status of the document or item. This is crucial in environments where sensitive information must be handled with the utmost care to prevent unauthorized access or handling.

Red ink clearly communicates the need for caution and denotes that the information should not be disclosed to unapproved personnel, aligning with the protocols put in place to safeguard classified materials. The distinctiveness of red also helps ensure that anyone handling these documents can quickly identify their classified nature, thereby reinforcing the importance of following proper procedures related to these items. This visual cue is essential within material management to maintain operational security and compliance with relevant regulations.