Maybe "optical stealth paint" will become standard satellite equipment very, very soon.... (wasn't a certain MISTY suspected of using something like that in the 1990s?)https://twitter.com/planet4589/status/1132401138257547271 …
....but most satellites uses metallic thermal reflective foil on the exterior anyway, even with big sheets of radiators on a common GEO comsat. 
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LEO satellites, including the ISS, are often visible when they pass overhead after sunset or before dawn. These were only particularly noticeable because they were temporarily so close together. Even then, they were only spotted by those who were looking for them.
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