What are the uses of colour in a world where nothing can see?

In a previous question - How might kinetosynthesizing "plants" look? - I introduced a worldbuilding thought experiment of mine centered around a habitable moon, heated by tidal forces, which orbits a rogue planet gas giant.

This planet harbors complex life, including animal-like fauna. Now, Earth animal use their coloration for many things - camouflage, mimicry, and display among them - but these things are only useful if there are other sighted beings around to see you.

On a rogue planet, there would be no need for a sense of sight, because there would be no sun and therefore virtually no light, except during fires, volcanic eruptions etc. My question is; on a moon where no life forms can see, what need would animals have to be one colour or another?

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What are the uses of colour in a world where nothing can see?

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