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Making Invisible Ink Appear

You can use ingredients like lemon juice, milk and baking soda to make your own invisible ink.
Making Invisible Ink

Invisible ink isn't just something you see in James Bond movies or X-Files re-runs. Even Harriet the Spy has her own invisible ink pens. In fact, prisoners of war used their own sweat and saliva as invisible ink.

The way invisible ink works depends on the method used to make it. There are several ways to make invisible ink and below you will find a few different recipes for making your own invisible ink and how it works.

Invisible Ink the Baking Soda Way

Mix about 1/4 cup (60 ml) of baking soda and 1/4 cup (60 ml) of water. Next, write using a Q-tip, toothpick or brush on a piece of paper. Let it dry completely. To read the secret message, paint grape juice concentrate across the paper with a paint brush or a sponge. Don't forget - grape juice stains.
Why it works: Grape juice has an acid that reacts with the baking soda. A different color appears wherever the secret message is written.

Invisible Ink the Milky Way

Put a little milk in a small bowl. Write with the milk on a piece of paper with a Q-tip or a brush. Let your message dry completely. To read the message just heat the paper. Use an iron or 100-watt light bulb or stove element. Don't rest the paper on the bulb. Ask an adult to help in case a fire starts and never use a halogen light.
Why it works: Milk is an organic product which means it comes from a living thing. When it's heated, it burns at a slower rate than the paper. Your invisible message shows up brown.

Invisible Ink the Lemon Way

This works the same way as the Milky Way. Simply dab a Q-tip or brush into a bowl of lemon juice and write away. Just make sure you don't use too much. To see the message, simply heat the paper after it dries. Another way to see the message is put salt on the drying ink. Give it a minute and then wipe the salt off. Use a wax crayon to color over the message.
Why it works: Both lemon juice and milk are mildly acidic and acid weakens paper. The acid remains in the paper after the juice or milk has dried. When the paper is held near heat the acidic parts of the paper burn or turn brown before the rest of the paper does.

These are only a few ways to make invisible ink. Using the same heat method, you can also use white wine, vinegar, apple juice, and even orange juice, to name just a few. Try some other fruit juices to see what works.

Do you have your own recipe for making invisible ink? What works best? Let us in on your secret.

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Comments

ivorie

ivorie wrote:

science awsome
commented: Sat Jul 12, 2014

arden_arden

arden_arden wrote:

I love writing in invisble ink
commented: Wed Feb 05, 2014

scarletletter

scarletletter wrote:

can we make that as refill in ur fountain pens?
commented: Sun Nov 24, 2013

there are 13 more comments

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TheTotallyAwesomeOne
To be brutally honest, this is a question I get asked about all the time... Now being a person who has been into technology for 13 years now - I can see why so many people have gone over to the world of technology now (I mean, we even have Curved 4K TVs now - which look absolutely awesome btw, but that's for me to talk about at another time).  Now it's important to remember that books are still extremely important. Although you can find almost everything on the Internet now - it's still sometimes useful to look in a book (even if that's not very often). So I do still think they have there place, and for people who actually like the authenticity of a physical book and not some thing that is on iCloud or whatever your chosen Online Storage Solution is. With technology moving the way it is these days, it's so much easier to use something like an iPhone, an iPad, or a Laptop (such as a MacBook Pro) to find the information you need. If you was to create a paper book of everything that was available on the Internet - let's put it this way, you'd need a rather large school bag... And rather large muscles!  :devil However, with something like a MacBook Pro (even the 15" Model), it's much easier to carry around, especially as it's much lighter than a lot of books - you can also take notes on it and edit photos and video, and listen to music, and watch films, and use KidzWorld ;) So personally, I'd take my MacBook and iPod Touch 5G (soon to be replaced with a Moto G) around with me all the time, I've had my time of using books. But as I said, other people may have different opinions;3
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honeybear42
hey
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Naye12
I Haven't Watch Fault In The Stars Yet. But Divergent Is A Pretty Good Movie. (:
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floreti
It's difficult to say because I love TFiOS, I think its a great book and film, but the Divergent series and film also looks good but I've never read/seen them, so I can't really make a refined judgement.
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floreti
They are right about that (:
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