I wanted to thank everyone for their helpful advice here. The chalkboard didn’t cause any problems, I got a cool design, and everything worked out.
The video I was making the design for is finished, the black chalkboard is the background for the scene starting at 1:50.
You can’t really see much detail, but the point was to have something that wasn’t totally black, to give a sense of realism. However, the floor and the judge’s desk in the first courtroom scene were engraved at DMS to, and you can see the details those.
thanks again everyone!!