Eraser

Description of the object

An eraser is a Stylo generally made up of 2 openings, one making it possible to erase an ink (generally pen-feather or even some pens ball), and another, which is a felt and which makes it possible to rewrite at the place where one erased.

Operation of the object

All inks used usually are organic compounds. They thus contain free electrons (known as combined electrons-π) which absorb part of the visible luminous spectrum and thus give a color to reflected light. This functioning mechanism only if the molecule is completely plane. The eraser (or rather the reagents which it contains) comes to disturb the geometry of the molecule and thus disturbs the mechanism described above, into consequent the light its color loses: ink disappears…

To erase with Sulphites

This disturbance can be caused by using sulphites. By this process the ions HO^- and HSO₃^- come to stick to the central Carbon of the molecule.

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