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Disappearing Ink is Not Just for Spies


Disappearing ink is a substance that is made from a number of chemicals with the purpose of having the ink visible to the eye for only a certain period of time.

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Characteristics of Disappearing Inks This type of ink is made without the intention of becoming visible again once it has disappeared.

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Characteristics of Disappearing Inks This is unlike invisible ink, which is made to become visible to the eye after a certain period of time with the application of heat or a reacting chemical. Invisible inks can also be viewed under ultraviolet lights.

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Making of Disappearing Inks Disappearing inks, in general, are based on a chemical reaction between sodium hydroxide and thymolphthalein. Thymolphthalein is a substance that is usually colorless, but when it is mixed with and applied with the sodium hydroxide, it turns into a blue solution.

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Making of Disappearing Inks This solution disappears, however, once it has been exposed to the carbon dioxide in the air. This causes the pH level to drop below 10.5, which makes the color disappear.

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Application of Disappearing Inks Disappearing Ink has been used in a number of instances with espionage, toys, pranks, art and anti-counterfeiting efforts.

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Application of Disappearing Inks In some cases, the disappearing ink is used on private documents that only need to be visible for a certain amount of time

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Disappearing Ink is Not Just for Spies  

Disappearing ink is a substance that is made from a number of chemicals with the purpose of having the ink visible to the eye for only a cer...

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