| MadSci Network: Other |
Dear Students,
Ask yourself, how does a carbon pencil work ? It leaves a trail of microscopic graphite "flakes" on the paper, visible as black or grey lines to the human eye. Eraser is just a soft rubber abrasive, which gently scrubs the top layer of paper, removing a little of paper together with graphite particles. Clumps of used rubber, mixed with paper and graphite are produced, as you probably have noticed. Erasing cannot be continuied ad infinitum because eventually one will wear a hole in the paper.
That's all I can tell off hand.
Hope it helps,
Yours Truly
A.G.E.
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