What makes a fluorescent highlighter marker so bright?

All that glows: what makes highlighter ink so bright and what else shines under UV light? - YP

Fluorescence - Wikipedia

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What are the differences in how pencil erasers and pen erasers work? - Quora

What makes a highlighter different than a yellow marker? - Quora

What are some things to be aware of when choosing a glow in the dark marker? Do we sell glow in the dark markers? • Learning Center • Arro-Mark® Company L.L.C.