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With these pens, you can make markings that are invisible to the eye under normal light and only visible under UV light. The ink is water-based and washable.

The manual describes the complete "Expertise Manager" software, as well as all the important functions of "Word" and "FixFoto". With a detailed index and many cross-references, it is an ideal reference work if you ever get "stuck" in one of the software programmes mentioned.