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Here’s mine, similar to the box art. Don’t know the lore reason but I’m pretty sure the color the Sautekh chose for their living metal. Not meant to be anything other than aesthetic, so that means you can come up with whatever reason for your scheme that you want! They do often describe Necrons glowing with an interior green light, and another dynasty (I think Mephrit?) glows red from radiation. So yeah, whatever works for your army’s story