The black-light pen or watermark stylus was a specialized felt-tipped marker originally designed by museums, restores, and forgery police to place invisible marks on items.
黑光笔或曰水印笔是一种特殊毡头标记笔，原由博物馆、修复专家或反赝品警察设计用来在物品上作隐形标记用的。
The black-light pen or watermark stylus was a specialized felt-tipped marker originally designed by museums, restores, and forgery police to place invisible marks on items.
黑光笔或曰水印笔是一种特殊毡头标记笔，原由博物馆、修复专家或反赝品警察设计用来在物品上作隐形标记用的。
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