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An ink killer (also or ink delete pin) is a pin, with which one can make corrections on with (usually only blue) ink written texts. Usually an ink delete pin consists of two parts. With the end one can make the ink "invisible", with which felt-tip pen at the other end then make the correction.
Pelican developed first means for removing from ink around approx. 1930 under the names "erasure water" and/or "ink death". In the 70's the ink delete pins were then developed.
All common ink are organic coloring materials. They contain "free" vagabonding electrons, which become lively from light of a certain wavelength coverage. The incident light is thus absorbed in this wavelength coverage. The light of the other wavelengths is reflected unhindered. The wavelength distribution changes thus with (partial) reflection, whereby the reflected light gets a color.
This mechanism functions only, if the color molecule is perfectly planar, thus flat. The ink delete pins disturb now geometry of the color molecules, the above mechanism function no longer and the reflected light lose its color.
This disturbance can take place for example with sulfites. Here OH and HSO3 deposit themselves to the central carbon atom of the coloring materials. For this are suitable for example Natriumsulfit (Na2SO3), sodium hydraulic gene sulfite (NaHSO3) or potassium sulfite (K2SO3).
Another, somewhat less effective possibility is the disturbance with carbonates such as Natriumcarbonat (Na2CO3) or Natriumhydrogencarbonat (NaHCO3). Here OH deposits itself likewise to the central carbon atom.
Beside some more complex materials last also dithionites or Thiosulfate come (e.g. NaS2O3) for ink killers in question.
In practice these reducing agents are strengthened still by other materials such as alcohol or soda (even the above Natriumcarbonat).
The ink is above described not destroyed with the erasing process like, but is not made only invisible. The back transformation into a visible form can take place with aldehydes and hydrogen peroxide.
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