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Making Invisible Ink Appear

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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Who's Your Favorite Spy?

  • Harriet the Spy.
  • The SPY Kids.
  • James Bond.
  • Agent Cody Banks.

General In The Forums

SailorMoonLover123
HI GUYS!!!!!! I LOVE SAILOR MOON AND KAKASHI HATAKE!!
reply about 5 hours
D3adp00
D3adp00 posted in Say Anything:
awww, thx
reply about 9 hours
Kirsteeeeen
Kirsteeeeen posted in Debating:
On a "normal" person, Polygraphs have a 70%-90% success rate. Now, the problem is that a lot of people aren't "normal". Some people are naturally anxious or have an anxiety disorder, which can mess up the results. Obese people often tend to sweat more, which will give the sensors bad readings.  So, is it a good tool for finding the truth? In certain circumstances, yes. Is it enough to convict someone of a crime? No.  ^^This There are so many variables, it's hard to make sure polygraphs are working to model standards.
reply about 11 hours
Kirsteeeeen
wow this topic is rarely spoken, thanks for sharing it!! [s:p/zxl] 8) 8) Thank you for reading! I think as days go by it gets more and more talked about, but I don't think there can ever be enough said, especially about positive strategies. It seems like we tend to dwell on the worst and not the solution sometimes. Not to mention I don't think there's anything inherently bad about these things.
reply about 11 hours
Kirsteeeeen
Ok so some things about my depression are like i found out i had it when i was 10. I might of had it before then but Idk. But like is a good thing i joined kw cause that's how my friend on here like figured out that i have depression and basically made me tell my mom and dad. And like also i kinda wanted to die and stuff and then later i kinda wanted to kill my self. And hurt my self. I kinda did a little bit but like not that much. And so like i had to do this weird therapy that didn't work. And then it kept getting worse and stuff and then like i went to the doctor and got some medicine but like they didn't give me any for almost a year probably until i was closer to 12. But the first one they tried made me like wake up sometimes and basically be really anxious like freaking out so much that i thought i might hurt myself or kinda other people or do things like run away. But it kinda helped the depression during the day and helped me to sleep sometimes better but like also i stopped wanting to do anything. So then i got a different one but it made me dizzy as soon as i tried it basically and so like after 3 days maybe then I spotted. But then i had to wait for them to get out of my system. After that i starred like regular therapy where you talk to the therapist. Like people told me it was bad so i really didn't want to go for a long time, but i went and it was kind of fun i guess like i could say anything and he wouldn't like be mad about me saying it or anything like he didn't judge and stuff. So i did that for a while like 2 or 3 months and i was feeling a lot better from that and some off the things we did. But like since my dad got a new job it has different insurance so i have to switch but we're just waiting to see like if i need to right now Thank you so much for sharing? You're really brave to talk about that, and I know that sharing your story is going to help somebody else. Thank you. :)
reply about 11 hours