Gardening

as well as controversial. A black tomato is a tomato that retains some chlorphyll upon ripening, and the green over red thing makes it look distinctly darker. The first two that "showed up", both in 1990, were Black Krim (I got it from a SSE member in Sweden), and Cherokee Purple (sent to me as an unnamed variety of likely Cherokee origin from a fellow in Tennessee). Soon after came those that the SSE got from Russia - Black from Tula, Black Plum, Southern Nights and Black Sea Man.

The purple types of blacks have clear skin - Cherokee Purple, Black Krim, Black from Tula, Southern Night, etc

the chocolate types have yellow skin- Cherokee Chocolate, Black Plum, Nyagous, Black Prince, and Japanese Trifele Black are examples.

So these are all black tomatoes; they have somehow been proliferating (either from discoveries or renamings of known varieties) over the past decades. And there is lots of misidentification starting to happen, apparent at Farmers Markets and smaller seed companies.