The use of blue ink in legal documents is often preferred and considered acceptable in many jurisdictions. The preference for blue ink is largely due to the fact that it helps to easily distinguish the original document from photocopies or scans, as black ink can be indistinguishable from the text printed on the document. While blue ink is generally acceptable, it’s important to check if there are specific requirements for certain documents. For instance, government forms or certain court documents may have stipulations on the color of ink to be used. It is always prudent to follow any explicit instructions provided, and in the absence of specific requirements, using blue or black ink is the norm for ensuring that the document is legible and professionally presented.