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Whereas inks exist which under the action of light entirely disappear - so far as our ordinary vision are concerned - many such, however, leave a trace on an ordinary photographic plate, and others can be revivified by suitable chemical reagents.

In fact, in nearly all cases it is possible to revive the characters.

In the following case, however, this cannot be done. The "ink" is made as follows: dilute some starch in water to the consistency of a cream and add a few drops of tincture of iodine. Dip the pen in the ink thus made and write on ordinary paper. The writing is plainly visible, and dries very quickly. To obliterate it completely, it is only necessary to rub it with a handkerchief or even with the hand--- and it will disappear as easily and completely as chalk from blackboard.





Granddad's Wonderful Book of Chemistry, Kurt Saxon, p.47, Experiment CXXVII.

COMMENTS

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lordess
16:25 Aug 15 2013

I don't quite get this, but I used to be fascinated (still am) with ink that can only be viewd under special lighting. Like UV, for example. I would scribble all over my body and get others to shine the light on me to see what I had written. Fun stuff.



*smilez*

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Seidr
21:09 Sep 04 2013

I found this recipe on a website as well, hopefully it will be easier to understand, it's more detailed.



http://www.helium.com/items/1047041-how-to-make-invisible-ink

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If the writing or drawing be made with a solution of silver nitrate, sufficiently dilute, so as not to injure the paper, the characters or drawing, when dry, will be invisible and will remain so if the paper be closely folded up or be in any other way kept from the light; but if the paper be exposed to the sun's rays or to a strong light, the characters speedily become visible, at first assuming a brown colour and finally turning black.



The same result can be obtained if the characters be exposed to fire.



Granddad's Wonderful Book of Chemistry, Kurt Saxon, p.30, Experiment XVIII.

Write or draw with the juice of an onion - the writing or drawing is invisible until warmed.





Granddad's Wonderful Book of Chemistry, Kurt Saxon, p.30, Experiment XX.

COMMENTS

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VvvVampireKisses
16:56 Aug 16 2013

** Wear glasses..

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Seidr
21:05 Sep 04 2013

... unless you want to cry some, fresh onion juice is a potent lacrymatory agent

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