Black paint of the V3? Went through Star Wars Screencaps last night and didn't see anything. There's like two good shots of that saber, and those are in SethS guide
And looking at this picture
View attachment 809410
there doesn't appear to be any on the "booster" section.
Now it's totally plausible that all the paint wore away. For instance, the V2 you can watch as it progressively loses more and more paint while filming. The deleted sandstorm scene, you can see it has quite a bit of paint. On the Emperor's chair, not so much. And when he catches it on the skiff, even less.
I’m telling ya, check out the duel scene on YouTube, star wars screen caps timing is off, U can see remnants of paint on the booster
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