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Thread: Interesting Invisible Ink Problem

  1. #1 Interesting Invisible Ink Problem 
    New Member
    Join Date
    May 2008
    Hi Boffins and Boffettes,

    I need to create an ink that after application will remain invisible to the naked eye for a period of 4 days, (or thereabouts). It must reveal itself without a secondary agent (just time and normal environmental conditions), and needs to be made from non-hazardous, readily available (though not necessarily household) chemicals.

    Really hoping someone can help me. It's a bit of an esoteric request, but it's actually quite important.

    Thank you. :-D

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  3. #2  
    Forum Masters Degree organic god's Avatar
    Join Date
    Feb 2008
    your best idea would be something which is oxidised by air, and the product of this oxidation has a colour assoicated with it.
    for example rust.
    iron is oxidised to rust coloured iron(iii) by air and water.

    you would need to experiment with concentrations and some other conditions and test the rate of oxidation. then you can get the right conditions for your 4 days.

    the readily available chemicals could be a problem. but do a bit of research and see what you get.

    everything is mathematical.
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