What makes a fluorescent highlighter marker so bright?

Yellow Highlighter Pens. Bright neon yellow colour. Ideal for highlighting passages of text. We aim to resolve any problem as quickly as possible.

Bright Fluorescent Yellow Colour Highlighter Pens Book Page Markers Highlighters

Zebra Mildliner Review The Best Highlighters - the paper kind

Wholesale Fluorescent Highlighter Pen Level Set For School, Art, And Painting Glass Light Blackboard Chalk Pen Supplies 201120 From Bai10, $9.1

The Best Highlighter Pens

How do Black Lights Work, Why do Highlighters Look So Bright, and How Can You Impress Your Significant Other with Science? – Sustainable Nano

BIC Brite Liner Highlighter, Assorted Ink Colors, Chisel Tip, Assorted Barrel Colors, Dozen

4 Pc Neon Highlighter Pen Markers Quick Dry Fluorescent Assorted Color — AllTopBargains

Deli 6 Very Bright Fluorescent Ink Color Highlighter, Low Odor, Non-Toxic, Dry Fast, Chisel Tip: 1-5mm, Highlighter for Students, Aspirants, Artist, Textliner Office Yellow, Green, Pink, Orange Highlighter, Assorted Colour

Non-fluorescent Highlighter : r/stationery