19802 Firefly Yellow 4.5 oz

The 4.5 oz bottle is a solid size for the price, and this fluorescent yellow is stupidly bright on paper. I've been using it to mark up dense readings, and the color pops enough that I can spot a line from across the room. Dries quickly without smearing, which is a win for my left-handed writing.

This yellow actually glows under a regular desk lamp, which makes finding my notes stupidly easy. One dip covers the whole line without dragging or skipping. The 4.5 oz size means I won't need to reorder for a couple of semesters, so that's a win.

The fluorescent glow is unreal — my notes practically light up the page, and the 4.5 oz bottle is huge for the price. It doesn't bleed through my paper, which is a nice bonus for a highlighter this punchy.