Carbon is the blackest black in the makeup market and in the eyeshadow world. Apply a bit and blend with the 224: you get Typographic.
Typographic is nice, but I use it when I want to deepen a color, without necessarily making it look black. For example, the other day, I wanted to darken Handwritten eyeshadow. Using the 219 brush, I applied a tad of Typographic in the outer corner and really blended it into the eyeshadow. The result was a super dark brown with no traces of black whatsoever.