Not sure what climate you are in but here in Cambodia you can gently press the fresh black seed into the ground anywhere with reasonably good, well draining soil, forget about them, and a month or so later you'll have a decent seedling. I "found" a 2 foot tall tree today that i literally did nothing for once the seed was in the ground. So the black coating doesnt inhibit anything that I've observed, at least not in the tropics! Good luck.

The black seeds were dried in the sun during one/two days. They look like yours in the photo.
The plants you see in the photo were seeded last 9 July.
Unfortunately they die in my climate during winter.