Meet New Friends!

Recommended friends are based on your interests. Make sure they are up to date.

Kidzworld Logo

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.

Related Stories:

Related Stories

Micro_top 10 ways to recycle-micro
Learning to recycle and waste less is important for keeping our planet green. If you care about t...
Want to make your own mark? Can’t find that mark at the craft store in the rubber stamp aisle? Ma...
Micro_a mic
Know that feeling you get when you make something out of nothing? Recycling is a great way to cap...

Who's Your Favorite Spy?

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

Random In The Forums

tbhskylas posted in Debating:
That i not the point. do you have a sister or brother. If you don't imagine you do. Then someone came up and cut there spinal cord. How would you feel? And if the mother doesn't want the child then she can give it up. And if they cant afford the cost of a new life(Which does make sense by the way)Then they can get help, go back to school or get a job. This isn't like they have no choice. They do.
reply 4 minutes
"tbhskylas" wrote: "Wishyouweremehehe" wrote: "AlphaT" wrote: "Wishyouweremehehe" wrote: women should have a right to choose an abortion up until the term in its pregnancy when it can actually sense itself which is about 6 months old, and guess what you cant actually abort a baby after 6 months in clinics so its not a big deal 1. What does it mean to sense oneself?  2. Why is self awareness the difference between life and death?  ​Since the baby isn't fully developed at that point it can not feel, learn, think, remember etc. so aborting it up until that point is completely harmless cause the baby has yet to know anything its basically just a wad of cells like a tumor till about 6 months in term. Aborting a baby in those months is literally like throwing away an egg and a ##### that happened to grow, and for some people that's a better option, in the United States thousands of people go bankrupt from medical bills including bills for child birth (which is ridiculous I don't think anyone should be charged for giving birth, thank god for canada's medical system) and that can put the mother out on the street homeless with a baby. Having a baby isn't a good option for everyone, think about girls in school or college who get ##### or whose partner convinces them not to use protection and then run out on them? The responsibility of caring for that child is forced upon the mother who typically doesn't have the funds or means to raise a child. And don't say "if they didnt want a baby they should have used protection or birth control, cause some time their partners are sleezeballs or they both forget or they are #####, and birth control is expensive and messes with you bodies hormones. And what about Mothers who just don't want that stress on their body? Cause birth is painful and exhausting and it can physically change a person. And what of the girls who it would possibly die when giving birth ? I strongly believe that no one should be able to force a person to something with their own body that they don't want to, now I don't exactly recommend abortion but I believe a woman would know when its a good time or not for her to have a baby. If a man can walk out of a pregnancy so can a woman. You just dont get it do you? Even though it cant feel or see that thing is still living. It is alive. It hiccups it burps twins play with each other. Its still there so that is exactly like killing a week year old baby. You are killing a life. That is not ok in ANYONES BOOK. or at least it shouldn't be. Technically by your standards we should all be in prison and ashamed of ourselves cause we stepped on an ant or ladybug, or because someone got treated for cancer because hey tumors are living they are LIFE.
reply 10 minutes
Ame-Alpha posted in Debating:
Omigosh Yes @Jordan08 i love what you post!  :)
reply 17 minutes
Honestly both suck, but i would definitely choose Hilary cause she stands for gun control and women's rights. Now i know alot of you Americans want your guns "for your protection" but is it really safe if just everyone can have one? Canadas gun laws are alot more strict and guess what our klast mass shooting was like 7 years ago and hardly as many people died in comparison as most of the shootings in the states. I already made my point about abortion up above, so yes i definitely think she's a better choice for the states even though shes not perfect but what politician is? Literally every politician is shady and has something they are hiding, and the FBI looked into her em**ls and found nothing, her deleting em*#ls means nothing what so ever, even if she deleted them they would still be on a server which the FBI would be able access yet they came up with nothing, yet there is viable proof that Donald Trump is a liar, racist, cheater, sexist, tax evader(he makes over a million each year and he avoids his taxes that means you either have to pay more taxes or your roads don't get fixed, your schools don't get funding, medical research gets less funding, military gets less and so on), he buys out from china, and he sides with Putin. This man is gonna end up with a world war on his hands if he wins because I bet he will sell out to the Russians in a heart beat because he is greedy.
reply 17 minutes
What if they were r*ped? They would have to have a baby. They should have a right to remove the fetus. Men should not choose what women do, and women should have the right to be able to control her baby. We do give the birth after all!!
reply 26 minutes