We know that "color" is a concept that Eridians will never be able to fully understand, and that human perception of it is the only way they'll likely ever have of knowing about it (sorry shrimp colors). What if, after Grace becomes the resident alien science teacher, the concept of "colors" becomes like. the Eridian equivalent of knowing your star chart or something.
Grace kicks the whole thing off by accident by telling his students what colors and patterns they have and they go absolutely nuts over this. Turns into this whole thing where they build these light sensors that can tell what general color someone's carapace is and if there are any patterns, or by knowing what material your carapace is you can have a vague idea of what color you are (like the difference between knowing your whole birth chart and knowing your zodiac sign)
And it becomes the Eridian version of a daily horoscope to look up what the lucky colors are that day or if spots or stripes will have more luck with their relationships. Rocky’s specific shade of brown is seen as supremely lucky by virtue of his mission, but with some more somber implications as well due to the loss of his crew. I imagine whatever Adrian’s carapace is (I’m a green Adrian truther personally) that their color scheme becomes one coveted by Eridians looking for their ideal mate- I mean who else gets to say that their mate saved the stars and then defied death multiple times to return to them??? That’s some Eridian fairy tale material right there.
The color of Grace’s hair or eyes becomes the color of Eridians known to be incredibly curious but foolhardy. Every Eridian in their teen angst phase is hoping against hope that they’ve got a smidge of blue somewhere on their carapace to prove that they’re Not Like Other Rocks.
And Eva Stratt in her infinite knowledge and love of piracy most certainly uploads the Hail Mary with copies of Pantone color palettes, so whichever Eridian scientist who stumbles across this while working with Grace one day will be one lucky rock after they label and program their color scanner with all the different meanings to be used by the general public. Grace will never know peace once he discovers he accidentally created a pseudo Astrology-core movement on Erid.
