There are many synonyms for the term "black-ink items" that refer to written documents that are legally binding. These include "contracts," "agreements," "deeds," and "treaties." Other terms that can be used to describe such documents might include "licenses," "policies," "authorizations," and "certifications." In general, any written piece of content that is considered to carry legal weight due to its formal language and binding nature can be referred to as a black-ink document. Such documents are often scrutinized in order to ensure that their contents are accurate and enforceable, making them an important part of many different industries and professions.