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The event horizon of a black hole is a spherical boundary that marks the point of no return for anything that gets too close. Imagine it as a cosmic point of no escape; once an object crosses this threshold, it will be inevitably pulled into the black hole due to its overwhelming gravitational force.

Think of the event horizon as the ultimate black hole boundary. It’s not a physical surface you can touch, but rather a region in space. Once an object crosses this invisible line, all forms of matter and energy (including light) are consumed by the black hole. This is why anything that passes the event horizon becomes invisible to an observer outside; it's as if it's been erased from the Universe, hence creating the blackest of blacks - a blackness that even the blackest black ink or paper cannot rival.

Gravitational pull is the invisible force that a black hole exerts on objects around it. It's so strong that it warps space and time, dragging even light into its depths. This might seem like something out of science fiction, but it's a very real property of celestial objects with a lot of mass.

In comparison to a black object like ink or paper, which only absorb light, the gravitational pull of a black hole is on another level entirely. It doesn't just absorb light; it captures it completely and indefinitely. The gravitational pull is such that it bends the path of light towards the black hole, and once the light crosses the event horizon, it can no longer escape, effectively making the black hole appear 'black'.

The visible light spectrum is the portion of the electromagnetic spectrum that the human eye can see. This includes all the colors of the rainbow, from red to violet, and everything in-between. When we see objects as 'colored,' it's because they are reflecting or emitting light within this range of wavelengths.

Black objects like ink or paper, absorb most of the light in the visible spectrum, preventing it from being reflected back to our eyes. However, even the darkest materials we can create on Earth are not completely black because some light, even if minimal, will bounce off or pass through them. Unlike these objects, a black hole absorbs light entirely making it truly 'non-reflective' and much darker than anything else we can experience in our daily lives.

Light absorption is a process where materials capture photons, the particles that make up light, and do not re-emit them. This results in objects appearing as a certain color or, in the case of black objects, the absence of color as they absorb nearly all wavelengths from the visible spectrum.

However, typical black objects on Earth have limitations in their light-absorbing capabilities. They might absorb a lot of light, but not all, which is why under intense illumination, you might notice some reflected light. But with a black hole, all light that hits it is absorbed and can't be reflected or emitted back. This total absorption is what makes black holes the epitome of blackness, surpassing any man-made material or naturally occurring object in darkness.