Jetec 54 Pack Retractable Rainbow Gel Ink Pens Bulk Mixing of Magic Tri-Color Gradient Blend Rainbow Gel Ink Pens for Notes, Doodling, Journaling, Office Documents(Multiple Styles)

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NiArt Retractable Rainbow Gel Ink Pens 12-Pack for School, Home, Office - Tri-Color Gradient Blend for Artistic Writing, Sketching, Journaling, Ergonomic Non-Slip Grip and Wide Clip for Easy Carry

Janlaugh 36 Pcs Rainbow Gel Pen Back to School Color Changing Pens Glitter Neon Rainbow Pens for Adult Coloring Books Drawing Doodling Journaling Crafts Scrapbooks Sketching Supplies

Zebra Sarasa Clip 0.5mm Ballpoint Pen, Marble Color 5 Colors Set (JJ75-5C-MB)

comments:

KameRose posted on r/pens5w

Hmm, most of what I've seen online consists of at least three colors swirled together. Try searching for swirl gel pen or rainbow gel pens and you'll see some results. Here are a couple examples: https://www.amazon.com/NiArt-Retractable-Rainbow-12-Pack-School/dp/B0CYBLNHBT/ https://www.amazon.com/Janlaugh-Changing-Journaling-Scrapbooks-Sketching/dp/B0CZDGTRBB/ https://www.amazon.com/Jetec-Retractable-Tri-Color-Journaling-Documents/dp/B0GDFJQ788/ https://www.amazon.com/Sarasa-Ballpoint-Marble-Colors-JJ75-5C-MB/dp/B07K834Y9P/

NiArt Retractable Rainbow Gel Ink Pens 12-Pack for School, Home, Office - Tri-Color Gradient Blend for Artistic Writing, Sketching, Journaling, Ergonomic Non-Slip Grip and Wide Clip for Easy Carry

Janlaugh 36 Pcs Rainbow Gel Pen Back to School Color Changing Pens Glitter Neon Rainbow Pens for Adult Coloring Books Drawing Doodling Journaling Crafts Scrapbooks Sketching Supplies

Zebra Sarasa Clip 0.5mm Ballpoint Pen, Marble Color 5 Colors Set (JJ75-5C-MB)