Why Do I Have to Use a Number 2 Pencil?

Why do exams always tell you to use a number 2 pencil? What happens if you don’t? Quick Questions explains!

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Sources:
http://www-03.ibm.com/ibm/history/ibm100/us/en/icons/testscore/

Why You Used to Have to Use #2 Pencils With Scantron Forms

http://mentalfloss.com/article/24832/what-makes-2-pencils-so-special
http://pencils.com/what-is-a-no-2-pencil/
http://www.howeverythingworks.org/page1.php?QNum=1529