How can i stop the color from updating, i am using a random color generation but i would like to save that color in a state how could i do that?

I am trying to make a sort of team bracket generator in react native and I keep getting this issue where the color is updating each time I add a new object to the array, I know that the render is updating each time you do a action, the question is how can I stop it from doing so ?

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Image may be NSFW.
Clik here to view.Image may be NSFW.
Clik here to view.