Item#: SCP-5835
Object Class: Euclid
Special Containment Procedures: Containment of SCP-5835 can only be achieved through the designation of a human subject in Foundation custody as SCP-5835-A (currently, D-69273 at Site-59 has been designated SCP-5835-A-27.)
In the event of SCP-5835 being released from SCP-5835-1, either through a Forgiveness Event or the subject's death, a new host is to be designated through the following procedure:

A D-class staff member will be selected.1
The candidate will repeat the statement "Yellow is the ugliest color in the world, and I wish I could never, ever, ever see it again." (This statement has been determined to be the most effective in initiating SCP-5835-A.)
Following the initial SCP-5835 manifestation event, the SCP-5835-A instance will be given preventative anger management seminars to ensure long-term containment.

Description: SCP-5835 is a tutelary parasite2 that takes the form of a male domestic canary3. It is capable of speech and answers to the name "Mr. Cadmium Charleston Conrad Cole the Canary-Colored Canary, Esquire", or "Cadmium" for short.
SCP-5835 appears only when a human subject expresses a desire to no longer see the color yellow. When this happens, SCP-5835 will manifest before the human subject, remove their ability to perceive yellow, then disappear. (The location of SCP-5835 between manifestation events is unknown.) Subjects have described yellow objects appearing to be white or gray.
While the perception of the color yellow is not necessary for human life4, SCP-5835 will continue to manifest before the subject, harassing them with facts about the color and its apparent importance. During this time, the subject is designated SCP-5835-A.
SCP-5835 will continue its binding to SCP-5835-A until either the apology or death of the subject. Multiple instances of SCP-5835-A cannot exist at the same time.
Additionally, as demonstrated by SCP-5835-13 and corresponding behavioral citations, SCP-5835 is unaffected by blunt-force trauma and gunfire.
Addendum: Manifestation Logs for SCP-5835-16
First Manifestation:

Date: 7/12/2017
Location: Site-59, Testing Room B12
Time: 09:35 EST
<Begin Log>
Dr. Mundy: Read from the sheet of paper.
D-29583: Um… "I hate yellow."
Dr. Mundy: Use the exact wording.
D-29583: What?
Dr. Mundy: Your cooperation is mandatory.
D-29583: I said I hate yellow. This says basically the same thing. The fuck's your problem?
Dr. Mundy: You need to — [hesitates.] Actually, fine. Use that energy, really resent the color.
D-29583: Sure. Fuck yellow. Yellow's a piece of shit. I hope someone comes along and kicks yellow in the dick.
[SCP-5835 manifests.]D-29583: Uh…D-29583: I mean, I was just saying what that guy over there told me to—[D-29583 becomes SCP-5835-A-16. SCP-5835 disappears.]
SCP-5835-A-16: The fuck was that?
<end log>

Second Manifestation:

Date: 7/16/2017
Location: Site-59, D-Class block, Cell 1594
Time: 13:40 EST
<begin log>
[SCP-5835-A-16 eats from his provided lunch tray. SCP-5835 manifests on his mashed potatoes.]
SCP-5835-A-16: Oh, fucking Christ—SCP-5835-A-16: Get off my food. Now.[Approx. ten seconds of silence.]SCP-5835-A-16: It's oatmeal, now fuck off.SCP-5835-A-16: Go. Away.[SCP-5835 aggressively defecates on the mashed potatoes, then disappears.]
SCP-5835-A-16: [incoherent screaming]
<end log>

Final Manifestation

Date: 7/25/2017
Location: Site-59, D-Class block, Cell 1594
Time: 01:45 EST
<begin log>
[SCP-5835-A-16 sleeps in his cot. SCP-5835 manifests on his nose.]SCP-5835-A-16: [stirring from sleep] …huh?SCP-5835-A-16: I'm trying to fucking sleep!SCP-5835-A-16: Look, I don't even hate yellow anymore. I hate you. GO AWAY!
[SCP-5835 hums to indicate thinking for approximately 15 seconds. SCP-5835-A-16 feels around for his shoe.][SCP-5835-A-16 moves his hands as indicated.]SCP-5835-A-16: Yes. Fine.SCP-5835-A-16: Sure. I swear. Are we done here?SCP-5835-A-16: Yes, I — wait, what?[SCP-5835 demanifests in an explosion, causing minor facial burns to D-29583.]
<end log>

Footnotes
1. As of Incident-5835-51, in which Junior Researcher Jacobs was killed when a SCP-5835 manifestation interrupted her maintenance check of the SCP-████ enclosure, only D-class personnel are to be used as SCP-5835-A.
2. "…while none of these types of reality-bending entities can be traced back to a single source, tutelary parasites all share a common purpose: defenders of abstract concepts from dissent. Though apparently omniscient, their potential for direct hostility is limited…" Dr. Isaiah Henderson, Advanced Classification of Reality Benders, 1987
3. Serinus canaria domestica
4. It should be noted that Junior Researcher Jacobs became an instance of SCP-5835-A by writing this article.

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