What color paint does Mirjana Milosevic use for her blacking out effects?

Mirjana Milosevic uses paint that appears to be black in videos seen of her live demonstrations, but it seems to have an artificial black look to it, almost too perfect. This leads me to believe that it's got to be some sort of "green screen" post-processing effect applied.

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My guess is the contrast has been increased and the brightness brought down a titch.