For the purposes of a test, a No. 1 pencil is a little too soft, and smudges easily; as you get higher in number, the lead becomes too dense and brittle to write and erase easily.

Tech News A Bottle Cap Pencil Sharpener Is Pure Genius By Andrew Liszewski Published February 22, 2013 | Comments (0) 𝕏 ...

This Ain Supplio pencil lead from Pentel uses nanotechnology to release allegedly mind-expanding aromas, letting you smell your way to smartness while you scribble your meandering prose on a piece ...

Julie Wernau , The Wall Street Journal 3 min read 08 Apr 2024, 07:57 PM IST ...