In what way is a black hole blacker than black ink or a black piece of paper?

A black hole is considered "blacker" than black ink or black paper because it absorbs all electromagnetic radiation, including visible light, and reflects none. This means that no light escapes from it, making it appear completely dark against the backdrop of space. In contrast, black ink and paper can still reflect some light, albeit very little, which is why they are not truly devoid of reflectivity like a black hole. Thus, a black hole represents a region of spacetime where gravity is so strong that nothing can escape, rendering it the ultimate "black" object.