Some EAS (Electronic Article Surveillance) tags do have ink, while others do not. The ink tags are designed to release a permanent or semi-permanent ink when they are tampered with or removed improperly, as a way to deter theft and make the item undesirable or unusable.
Ink tags are typically used on high-value or high-risk items such as clothing, electronics, and accessories. They are designed to be difficult to remove, and attempting to remove them improperly can cause the ink to spill and damage the item.
However, not all EAS tags have ink. Some are designed to simply set off an alarm if they are not deactivated or removed properly at the point of sale. These tags are usually less expensive and less intrusive than ink tags, and are commonly used on items like books, CDs, and DVDs.
It is always best to assume that an EAS tag may have ink, and to seek professional help when dealing with them to avoid any legal or safety issues.