It means "he/it was able to render all the shades of black brilliantly/with genius". Maybe this sentence talks about a painting in which the shades of black colour have an important role. But it's not easy to understand properly what it's talking about, you have to specify the context. I hope to have helped you!!!

It means "he/it was able to render all the shades of black brilliantly/with genius". Maybe this sentence talks about a painting in which the shades of black colour have an important role. But it's not easy to understand properly what it's talking about, you have to specify the context. I hope to have helped you!!!