Naked Science Forum
General Science => General Science => Topic started by: Seany on 06/04/2008 20:07:57
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We use fountain pens in school using blue ink.. And almost everyone has an ink eradicator, which is a pen, one side with a white lid, the other end with a blue lid.. The end with the white lid is like a felt tip pen, but no visisble ink comes out.. But it erases the blue ink.
Then you use the blue lid end to write over the erased ink!!
Now how do these work?? (There is a rumour that the white side is made with sheep's weee!! It does smell funny)
(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2Fwww.whsmith.co.uk%2FImages%2FProducts%2F%2F900%2F%2F001%2F%2F90000140_l_f.jpg&hash=d7c375a2403fde9502d1f842111e7be1)
(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2Fwww.whsmith.co.uk%2FImages%2FProducts%2F%2F900%2F%2F001%2F%2F90000140_l_b.jpg&hash=470217031e6fbb71eec176e33c964401)
Maybe it was made by accident?? Like there was a spill of blue ink on the floor, and a sheep peed over it, and it disappeeared?? [???]
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Neilep, fancy peeing on ink....disgusting.
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Thank you for answering my question..
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I'm sure it isn't neilep's doings. I should imagine it is a solvent of a bleach of some sort.
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Yes, but it is very fascinating if you see it the first time!
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I have never seen a pen that worked like that.. I will have to acquire one and test it out!
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The eraser pen probably contains a bleach that bleaches out the colour in ink by oxidising it. Chlorine and peroxide based bleaches are the most often used in stain removal from clothes. The ink of course must be a non permanent type that responds to bleaching permanant legal inks and Indian ink cannot be bleached out.
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Thank you Soul Surfer..
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Here's a good link that might help:
http://www.ehow.com/how-does_5019302_ink-eraser-work.html (http://www.ehow.com/how-does_5019302_ink-eraser-work.html)
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Here's a good link that might help:
http://www.ehow.com/how-does_5019302_ink-eraser-work.html (http://www.ehow.com/how-does_5019302_ink-eraser-work.html)
But it doesn't explain which are the chemicals for ink and for eraser.