Editing The Neathbow

location = [[The Neath]]<br>[[Parabola]]<br>[[The High Wilderness]] (rarely)||related=[[Slobgollion]]}}<blockquote>''"A dazzling contraption for safely viewing and displaying those colours that are unique to the Neath. Delightful at parties. WARNING: Do not gaze onto the device for longer than seventy-three seconds."''<ref>{{Citation|https://fallenlondon.wiki/wiki/F.F._Gebrandt%27s_Patent_Neathoscope,_Containing_and_Displaying_All_Seven_Colours_of_Exotic_Light|F.F. Gebrandt's Patent Neathoscope, Containing and Displaying All Seven Colours of Exotic Light|Fallen London}}</ref></blockquote>

The '''N<span style="background-color: #00008b">e</span><span style="background-color: #8B0000">a</span><font color="black"><span style="background-color: #40E0D0">t</span><span style="background-color: #45e040">h</span><span style="background-color: #FFA500">b</span><span style="background-color: #ff00c9">o</span><span style="background-color: #808080">w</span></font>''' is a set of seven impossible colors.__FORCETOC__

<blockquote>''"A book for children. One page is devoted to each of the colours of the Neath, which are not found on the Surface."''<ref>{{Citation|https://sunlesssea.miraheze.org/wiki/THE_NEATHBOW|THE NEATHBOW|Sunless Sea}}</ref></blockquote>

The Neathbow is the collective term for seven colors which cannot be seen on the [[Surface]]. They are commonly observed in the [[Neath]], hence the name,<ref>{{Citation|https://sunlesssea.miraheze.org/wiki/THE_NEATHBOW|THE NEATHBOW|Sunless Sea}} ''"[...] each of the colours of the Neath, which are not found on the Surface."''</ref> but they also appear in places like [[Parabola]]<ref>{{Citation|https://fallenlondon.wiki/wiki/Parabola_tattoo|Parabola tattoo|Fallen London}} ''"There are colours which can only be seen in sleep [...] Cosmogone and viric."''</ref> and the [[High Wilderness]].<ref>{{Citation|https://sunlessskies.miraheze.org/wiki/The_Stair_to_the_Sea#On_the_Quiet_Sea|Approach the Gate|Sunless Skies}} ''"Two vast winged shapes guard a gate of something like resin, smooth but uneven. It is deep gant [...]"''</ref><ref>{{Citation|https://sunlessskies.miraheze.org/wiki/Deep_in_the_Spawning_Morass#Story_description|Story description|Sunless Skies}} ''"The only light comes from smouldering apocyan pyres [...]"''</ref> The origin of the Neathbow is unknown, but the colors seem to arise from properties of light that only exist "in the dark."<ref>{{Citation|https://fallenlondon.wiki/wiki/The_Prelapsarian_Museum:_Optical_Exhibits|The Prelapsarian Museum: Optical Exhibits|Fallen London}} ''"The centrepiece of this wing will be a series of exhibits on neathy optics – the properties of light that can only exist in the dark."''</ref><ref>{{Citation|https://fallenlondon.wiki/wiki/Whoever_you_can|Whoever you can|Fallen London}} ''"[...] the variant spectrum of night: the colours called irrigo, cosmogone, violant, apocyan."''</ref> Each Neathbow color has unique effects on those exposed: for example, [[irrigo]] light induces memory loss,<ref>{{Citation|https://fallenlondon.wiki/wiki/Empty_an_irrigo-filled_box|Empty an irrigo-filled box|Fallen London}} ''"The light scrapes a few immediate plans from your mind, the names of a passing acquaintance or two."''</ref> [[viric]] light induces drowsiness,<ref>{{Citation|https://fallenlondon.wiki/wiki/Empty_a_viric-filled_box|Empty a viric-filled box|Fallen London}} ''"The light lazily seeps out of the box when you open it, or as lazily as light can move. You let out a long, languid yawn."''</ref> and [[violant]] ink is hard to forget and nearly impossible to erase.<ref>{{Citation|https://sunlesssea.miraheze.org/wiki/A_Pot_of_Violant_Ink#Item_description|Item description|Sunless Sea}} ''"It's very hard to forget anything you've written in violant ink...""''</ref><ref>{{Citation|https://fallenlondon.wiki/wiki/Write_something_to_sear_the_eyes_of_fools_and_lift_up_the_great_powers|Write something to sear the eyes of fools and lift up the great powers|Fallen London}} ''"The ink makes the whole indelible."''</ref> Neathbow light can also be trapped and transported in devices called Mirrorcatch Boxes.<ref>{{Citation|https://fallenlondon.wiki/wiki/Mirrorcatch_Box|Mirrorcatch Box|Fallen London}}</ref> Given these properties, Neathbow colors have many applications, including art,<ref>{{Citation|https://fallenlondon.wiki/wiki/Shades_of_Yesterday|Shades of Yesterday|Fallen London}} ''"Artists and the literati rejoice — a pen show visits London! [...] Inks, in all the wild colours of the Neath! Try them to your hearts content! [...] look at all the lovely pens."''</ref> technology,<ref>{{Citation|https://fallenlondon.wiki/wiki/Crack_open_the_Sounder_and_capture_its_operating_principle|Crack open the Sounder and capture its operating principle|Fallen London}} ''"It contains a connection that cannot be easily severed. [...] You will always get a Violant-filled Mirrorcatch Box."''</ref> and esoteric rites.<ref>{{Citation|https://fallenlondon.wiki/wiki/Shrine_to_Saint_Joshua|Shrine to Saint Joshua|Fallen London}} ''"It is carefully concealed and draped with veils of irrigo, so that you forget the hidden rites almost as soon as they are performed."''</ref>  

Neathbow colors are not strict hues; they include shades like normal colors do.<ref>{{Citation|https://discord.com/invite/failbettergames|Bruno (FBG)|Failbetter Games Discord Server}} ''"The neathbow colors contain different shades, just like real colors"''</ref> Thanks to this and the fact that they are "impossible colors" distinct from the spectrum of visible light, their depictions often vary between illustrations.<ref>{{Citation|https://discord.com/invite/failbettergames|Bruno (FBG)|Failbetter Games Discord Server}}''"We are and have been inconsistent in how we represent neathbow colors visually in the games ... Neathbow colors not being real means that we are inherently fudging when we portray them visually."''</ref>

Gant's beige shade may have been inspired by the color [https://en.wikipedia.org/wiki/Eigengrau eigengrau], which people reportedly see in the absence of light.<ref>{{Citation|https://en.wikipedia.org/wiki/Eigengrau|Eigengrau|Wikipedia}}</ref> It may also be a reference to [https://en.wikipedia.org/wiki/Cosmic_latte cosmic latte], the beige-like average color of the universe.