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* ''Series/CriminalMinds'': One episode features an [=UnSub=] covered in tattoos. During the autopsy (he'd comitted suicide at the start of the episode), Redi discovers that the [=UnSub=] had a second set of tattoos done in invisible ink that only appear under [=UV=] light.
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* OR use ordinary table salt and make it visible with silver nitrate solution. This needs time to develop and doesn't disappear.

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* OR use ordinary table salt and make it visible with silver nitrate solution. This needs time to develop and doesn't disappear. It ''does'' turn the entire sheet black after some time, though.
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* In the ''WesternAnimation/GravityFalls'' episode "Scary-oke", Dipper panickedly flips through Journal 3 while standing near a UV light from the party that was being held, and discovers that the Journals turn out to have additional writing in invisible ink made visible through a black light. Throughout the remainder of the series, these blacklight messages are shown to include some cipher sequences used to encode cryptograms found throughout the rest of the journal, a correction to an entry about giant vampire bats clarifying that they are actually ''fruit'' bats, the location of a hidden bunker and a guide for getting past its security system, information on how to defeat certain monsters, and several warnings.

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* In the ''WesternAnimation/GravityFalls'' episode "Scary-oke", Dipper panickedly flips through Journal 3 while standing near a UV light from the party that was being held, and discovers that the Journals turn out to have additional writing in invisible ink made visible through a black light. Throughout the remainder of the series, these blacklight invisible ink messages are shown to include some cipher sequences used to encode cryptograms found throughout the rest of the journal, a correction to an entry about giant vampire bats clarifying that they are actually ''fruit'' bats, the location of a hidden bunker and a guide for getting past its security system, information on how to defeat certain monsters, and several warnings.
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* In the second season of ''WesternAnimation/GravityFalls'', Dipper discovers that the Journals have additional writing in invisible ink made visible through a black light.

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* In the second season of ''WesternAnimation/GravityFalls'', ''WesternAnimation/GravityFalls'' episode "Scary-oke", Dipper panickedly flips through Journal 3 while standing near a UV light from the party that was being held, and discovers that the Journals turn out to have additional writing in invisible ink made visible through a black light.light. Throughout the remainder of the series, these blacklight messages are shown to include some cipher sequences used to encode cryptograms found throughout the rest of the journal, a correction to an entry about giant vampire bats clarifying that they are actually ''fruit'' bats, the location of a hidden bunker and a guide for getting past its security system, information on how to defeat certain monsters, and several warnings.

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trope was cut/disambiguated due to cleanup


* In ''Webcomic/GirlGenius'', the librarians at the Incorruptable Library [[https://www.girlgeniusonline.com/comic.php?date=20160201 shine a UV light]] at Van Rijn's notebook (using the same wavelength as the Storm King's lightning) to reveal an entirely new work that Agatha had missed completely. He apparently used multiple methods to conceal his work including "phasing ink, momentum writing, four-dimensional cryptograms, [[TheLastOfTheseIsNotLikeTheOthers and lemon juice]]". Agatha later gets a bit over-enthusiastic about finding the hidden writings, and discovers that if you study the vellum (calfskin) pages ''really'' closely, they contain instructions for building a cow.

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* In ''Webcomic/GirlGenius'', the librarians at the Incorruptable Library [[https://www.girlgeniusonline.com/comic.php?date=20160201 shine a UV light]] at Van Rijn's notebook (using the same wavelength as the Storm King's lightning) to reveal an entirely new work that Agatha had missed completely. He apparently used multiple methods to conceal his work including "phasing ink, momentum writing, four-dimensional cryptograms, [[TheLastOfTheseIsNotLikeTheOthers and lemon juice]]".juice". Agatha later gets a bit over-enthusiastic about finding the hidden writings, and discovers that if you study the vellum (calfskin) pages ''really'' closely, they contain instructions for building a cow.
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-->-- '''Maxwell Smart'', ''Series/GetSmart''

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-->-- '''Maxwell Smart'', Smart''', ''Series/GetSmart''

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