Irrigo
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"I is for IRRIGO. No one remembers why. Irrigo colours the forgotten corners of home."[1]

The most easily found color of the Neathbow, irrigo is the unremembered color, the light of absence.[2] Its name comes from the Latin irrigo, meaning to flood or overwhelm, or, even more suitably, to diffuse or shed.
Properties
Exposure to irrigo causes severe memory loss; overexposure to it can result in total ego death. Continuous exposure to irrigo can also cause thick, bony plates to grow over one's eyes, creating disgusting eyeless skulls.[3] The Cave of the Nadir is filled with dangerous irrigo radiation,[4] so explorers use tea brewed from Ray-Drenched Cinders to protect themselves.[5]
Uses
Irrigo can be infused into objects,[6] and Midnighters use shrines and robes that are draped in this color to perform their rites.[7] The Irrepressible notably uses powerful irrigo weaponry.[8] Irrigo seems to internally retain the memories it steals, so Fluke-Cores often have years worth of histories and experiences stored within them.[9]
Gallery
Of course, Neathbow colors are not a single thing but include shades, as real colors do.[10] That said, irrigo is usually portrayed as a bright violet with a high-intensity radiation quality.[11]
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A Shrine to St. Joshua.
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An eyeless skull.
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The Gate of the Nadir
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Irrigo fog. Beware.
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A Nodule of Violet Amber.
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A Pair of Irrigo Goggles.
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A Strange-Shore Parabola Suit.
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A Strange-Shore Parabola Frock.
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A cobweb in the Nadir. Charming.
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A stone altar in the Nadir.
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A Fluke-Core. Mourn the mind that has passed.
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Irrigo anemones on the zee-floor.