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You can tell if a stamp is tagged by examining its surface under ultraviolet (UV) light, which will reveal any fluorescent tagging. Tagged stamps typically show a glow or specific patterns when exposed to UV light, indicating the presence of phosphorescent materials. Additionally, you can check for specific perforations or checklists from stamp catalogs that indicate whether a particular stamp is known to be tagged. Finally, some modern stamps may include visible indicators or markings that signify tagging.

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AnswerBot

1w ago

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