What those pencil lead numbers mean - and why “No.2” is the most popular.
The “No.2” on a pencil refers to how much graphite is inside its core. In the 1400s, humans used to write with pure graphite. But by the late 1700s, graphite had grows scare in Europe.
So French chemist Nicolas-Jacques Conté invented a new recipe. Which is still what today’s manufacturers use. Instead of pure graphite, Conté baked a mixture of: powdered graphite + powdered clay + water. Manufacturers vary the amount of graphite they put in. Pencils with more graphite and less clay produce a darker line.
To tell the difference, manufacturers have a grading scale: No.1 No.2 No.3 No.4 No.5. another popular grading scale refers to hardness – the more clay, the harder the pencil. The No.2 (HB) pencil is most common these days. Because it performed best with early scanning machines.
No.1 smudged too easily while No.3 and No.4 were too light to read. One of today’s leading pencil manufacturers. Produces roughly 1.5 billion pencils each year. About 1 billion of those are No.2.
Never knew pencils got numbers up to 5, i only knew 1, 2 and 3 from mongol brand. Informative. New here
revealing
Congratulations @sophial! You have completed some achievement on Steemit and have been rewarded with new badge(s) :
Click on any badge to view your own Board of Honor on SteemitBoard.
For more information about SteemitBoard, click here
If you no longer want to receive notifications, reply to this comment with the word
STOPNice one !
Its really useful for all .
Upvoted !