Which type of redaction creates a solid black box?

The type of redaction that creates a solid black box is specifically known as black redaction. This method involves overlaying black ink or a black box over text in a document, effectively hiding sensitive information from view. This approach ensures that once the black box is applied, the content underneath cannot be read or recovered, providing a clear and effective means of redaction that maintains the integrity of the document by visually indicating what has been concealed.

In contrast, other types of redactions serve different purposes. For instance, text redaction might involve removing or altering text while maintaining readability of the document in some form. Cross redaction could refer to a different or more nuanced redaction approach where certain patterns or sections are obscured in a non-standard manner. White redaction typically means that text is changed to white, which could allow for background viewing if the document is printed or viewed in a specific way, failing to provide the complete invisibility of black redaction.