I probably shouldn't post this, but if you look in the notes about designing your own shipset, you'll find that true black (RGB 0,0,0) get treated as transparent by the game. Thus if every ship image, and your race flag, were set to true black, you'd be completely invisible, even when over someone's planets.
This would be exceptionally despicable to do against another human. Thus I recommend you reserve it for hotseat games against your brother (those who have them that is).
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