I used Black 2.0 and Black 3.0 and kinda prefer 2.0 for most things - easier to use.

My favorite project was making a weird edge disappear in the apartment. Notice how the edge and white draw the eye away and create visual noise:

https://photos.app.goo.gl/UydkPpEZJUL3jtaF9

When I applied a regular black on the top and 3.0 in the edge, it blends in with the dark window framing, even during the day:

https://photos.app.goo.gl/gqjco8jWN5gsKTWf6