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Detect-o spy Lamp
From Arthur Wiki
Revision as of 10:19, 22 January 2020 by addChangeTag.php>Alex speaks (link)
A detect-o spy Lamp[1] is a special light used to reveal messages written in invisible ink. Fern used one to read Persimmony Glitchet's letters that were written in invisible ink. There is a chance that the lamp is Horrendously Horrible Happenings merchandise, as Fern said that Victor Bronte used one in Book 5: The Malevolent Mailbox.
The lamp probably emits ultraviolet light, which causes certain invisible inks to fluoresce.