Fact Friday – Erasers

I go through erasers like you won’t believe it, not necessarily because I finish them but mainly cause I keep misplacing them. Also I love them. I have ones like little rubber ducks, I have chocolate scented ones and cupcake ones. Erasers are just awesome.

We got a set of Crazy Erazi and the unicorn keeps saying he can’t believer they are actually erasers, they look exactly like the stationary we get in the shops, and he’s right. Have you seen them yet? You can get them from most stores and the cool thing is that they aren’t linked to in store purchases whoop so go try collect all 13. We might need to get more cause Fysh and I are arguing about who gets which but at R7 a piece friends can be expecting random erasers as gifts for a while ;)

So these very realistic erasers of course raised the question, what are erasers made from and how exactly are they made. I thought they were made from rubber and I’m kinda right. Turns out that the less expensive erasers are made from synthetic rubber and synthetic soy-based gum, but more expensive or specialized erasers are vinyl, plastic, or gum-like materials.

 


 

Five Fabulous Facts :

  • Until the 1770s, humanity’s preferred way of erasing errant graphite marks relied on bread that had been de-crusted, moistened and balled up.
  • Pencils work because, when they are put to paper, their graphite mingles with the fiber particles that comprise the paper. And erasers work, in turn, because the polymers that make them up are stickier than the particles of paper — so graphite particles end up getting stuck to the eraser instead. They’re almost like sticky magnets.
  • The little erasers on pencil ends are known as plugs. And those small bands of metal that contain the plugs are called ferrules.
  • Many erasers contain volcanic ash. Those pink erasers on the tops of pencils in particular make use of pulverized pumice to add abrasiveness. And pumice is, of course, volcanic ash.
  • The same guy who discovered oxygen helped to invent erasers. In 1770, the natural philosopher and theologian Joseph Priestley described “a substance excellently adapted to the purpose of wiping from paper the mark of black lead pencil.” The substance was rubber.

 

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