Fluorescent highlighter ink appears brighter than regular ink because it contains fluorescent pigments that absorb more light, including ultraviolet light, and reflect it back. Regular pigments only reflect the color seen, while fluorescent pigments absorb unseen ultraviolet light which excites the electrons in the pigment atoms, giving them energy and making the ink glow brighter, especially under ultraviolet light.

1. What Makes Highlighter Pens So Bright?
Fluorescent ink is known for being darker than regular types of ink, especially
under ultraviolet light. The ink consists of fluorescent pigments, which absorb and
reflect more light than ordinary inks.
Regular pigments cause materials to be a sure color because they take in some
parts of the clear spectrum while reflecting the vision of light reciprocal to the
color you see.
Fluorescent pigments take unseen light too, but they are also very delicate to the
higher energy of ultraviolet light. Ultraviolet light takes in by these pigments
thrilling electrons surrounding the atoms of the pigments, giving them energy.
So, if you are familiar with the flawless use of highlighter then start purchasing
from private label highlighter makeup - Aurora Formula Co. Ltd.