TIL that the hard blue end of an eraser wasn't designed for erasing ink. It is meant for erasing pencil from heavier paper that would otherwise wear down the softer, pink side. :
U Brands Microfiber Shag Dry Erase Board Eraser, Washable, 1 Pack (582U04-16) - 6.40" Width x 3" Length - Durable, Washable, Soft - Blue - MicroFiber, Cloth - 1Each
The Pencil Grip Magnetic Whiteboard Eraser - 2" Width x 4" Length - Ergonomic Design, Soft, Dirt Resistant, Magnetic - Blue - 1Each | Bundle of 2 Each - Walmart.com
4imprint.com: Create A Pencil - Blue Eraser 124238-BL
They Told Us They Could Erase Pen, But It Turns Out Blue Erasers Have An Entirely Different Purpose
Emraw Bright Color Oval Soft Pencil Mark Eraser Rubber for School, Office, Art, Drawing – Colors Included: Pink, Green, Sky Blue, Purple (4-Pack)
Koh-i-noor Soft Kneaded Eraser Blue Eraser in Hard Cover - Etsy
WTF! The Blue Side Of Eraser Is Used For A Different Reason - Boldsky.com
Blue Erasers
Blue Erasers
Staedtler : Combi Mars Plastic Eraser White & Blue | Jackson's Art Supplies
Emraw Two-Tone White & Blue Vinyl Soft Pencil Mark Eraser Rubber for School, Office, Home (8-Pack)
WTF! The Blue Side Of Eraser Is Used For A Different Reason - Boldsky.com
Blue Erasers
Emraw Two-Tone White & Blue Vinyl Soft Pencil Mark Eraser Rubber for School, Office, Home (8-Pack)
What is the blue side of an eraser for? - Quora
1pc Cute Simple Blue Eraser Creative Cloud Sky Soft Rubber Kawaii School Office Supplies Erasers for School Stationery|Eraser| - AliExpress