In the Correspondence Manual, originals of correspondence must be written in what color ink?

In official correspondence as outlined by the Correspondence Manual, originals of correspondence must be written in black ink. This requirement is in place because black ink offers the best readability and provides a clear and professional appearance that is essential for official documents. It ensures that text is easily distinguishable and maintains a formal standard across all communications, especially in legal and administrative contexts where clarity and formality are paramount. The use of black ink also ensures consistency and avoids any potential confusion that might arise from the use of other colors, which could be associated with other meanings or purposes in documentation.