As for genetics, the random/average North American ebony can be considered dominant, recessive and accumulative. At least on this side of the world.
Many breeders back in the day, bred all the different dirty bellied ebonies together, with little consideration as to whether they were breeding recessive charcoals or dominant ebonies, etc... (You can read about all the different ebony type mutations in the US back in the day, in the Alice Kline book on Genetics, I believe.).
Luckily some places like in the UK or abroad, didn't breed all the different strains of ebonies together, and they do have their recessive charcoals apart from their ebonies.
If it sounds confusing, just think of someone who was to breed all different beiges together, recessive beiges and dominant beiges- every kind you know of or have ever heard of.
And call that mutation just simply beige (no mention of dominant or recessive.). All bred together, all different genotypes. It's quite the genetic mess if you think about it.
It would take several generations of outcrossing strictly to standards, to figure out just which strain of ebony you have.