A security marker is a type of marker used to label or mark items in a way that makes them difficult to tamper with or alter. These markers often contain special ink or features, such as invisible UV ink, that are only visible under specific conditions, like ultraviolet light. Security markers are commonly used for identifying valuable items, labeling documents, or preventing counterfeit products. They can also be used to mark personal belongings for theft prevention, as the markings are unique and difficult to remove or duplicate, offering an added layer of security.

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