home · electrical safety · How to make an invisible pen. How to make invisible ink at home. Making invisible ink from baking soda

How to make an invisible pen. How to make invisible ink at home. Making invisible ink from baking soda

The use of invisible (sympathetic) ink is not only an integral part of children's spy games, but also original way surprise your friends at a party or propose to your girlfriend. It is very easy to prepare them at home, and they contain the most common ingredients that are found in any home.

Usually, to effectively display such ink, they first write on paper secret message, and on top of another message in the usual way. This is how encrypted information was transmitted back in ancient times.

There are several types of sympathetic ink; they are distinguished not only by their composition, but also by the conditions under which the ink becomes visible.

Invisible ink at home using lemon

The recipe for invisible ink made from citric acid is one of the simplest and easiest to prepare. You only need half a lemon or liquid lemon acid, water, a deep plate, a brush and a sheet of white paper.

  • First you need to squeeze the juice from the lemon into a deep plate and add a large number of water. In principle, it is not necessary to dilute the lemon juice, but then the ink will initially be slightly visible on the paper.
  • Mix the contents of the dishes.
  • Wet the brush with the resulting liquid and write your message on white paper.
  • Wait until the liquid is completely dry.
  • When the time comes to read the message, the piece of paper must be heated. A table lamp, iron, candle or oven is suitable for this.

Due to the fact that lemon juice has the ability to oxidize when heated, it will change color to brown. Ink prepared without lemon, but, for example, from onion juice or honey, will work on the same principle.

Invisible ink from soda

There are several options for making invisible ink from soda, but all of them are simple to implement.

For the first recipe you will need baking soda, warm water, a piece of paper and a cotton swab or brush.

  • Mix baking soda and water in a 1:1 ratio.
  • Stir until the soda dissolves.
  • Soak a cotton swab in the resulting liquid and write a secret message on the paper.
  • Wait until the inscription is completely dry.
  • To demonstrate your message, you need to heat the piece of paper using a lamp or any other method. However, do not forget about safety precautions when working with heating elements to prevent the paper from catching fire. You should prepare a container with plain water, to extinguish the burning paper if the process does not go according to plan.

The second type of invisible ink recipe using soda involves using grape juice to reveal the code. After applying the ink to the paper and drying it, you do not need to heat the sheet of paper to develop the message. Simply dip a brush or cotton swab in grape juice and paint the paper until the symbols appear. This occurs due to entry into chemical reaction soda and grape juice.

Invisible ink made from milk

An incredibly easy way to make invisible ink. The ingredients you will need are milk, a sheet of paper and a brush.

  • Write a message on a piece of paper with a brush dipped in milk.
  • Wait until the inscription dries thoroughly.
  • To manifest the message, just gently heat a sheet of paper.

Invisible ink from washing powder

For this recipe, prepare a small amount of washing powder, water, a sheet of paper, a brush, a deep plate and an ultraviolet lamp.

  • Mix the powder with water and stir.
  • Write an encrypted message on a piece of paper with a brush soaked in the solution.
  • Let dry.
  • To view the inscription, you need to turn off the light and bring an ultraviolet flashlight or lamp to the paper. The symbols will glow in the dark.

Invisible ink at home from starch

Ingredients for cooking:

Starch,

A small saucepan or ladle,

brush,

Paper,

Aqueous solution of iodine.

1) First you need to cook a starch paste. To do this, mix 2 parts starch and 1 part water in a ladle or saucepan. The resulting mass must be simmered over low heat until it warms up, while stirring thoroughly.

2) Allow the paste to cool.

3) Dip the brush into the resulting ink and write in large characters on a sheet of paper.

4) Allow to dry.

5) To read the message, you need to paint the paper with an aqueous solution of iodine. The inscription will turn bright purple.

Knowing the principle of interaction between starch and iodine, this recipe can be slightly modified if you do not have pure starch at home. It is enough to cook thick rice porridge instead of paste, since rice contains a large amount of starch. Further steps do not differ from those described in the recipe with pure starch.

There are also ready-made kits for preparing ink on sale, as well as various pens filled with already prepared sympathetic ink. However, prepare them yourself from simple and available funds It will be much more exciting not only for a child, but also for an adult.

Video on the topic of the article

Invisible ink - The best way masking important text. Some still remember how, during the Soviet Union, Lenin managed to convey important statements from prison to his comrades, on the pages of an ordinary fiction book. Making invisible ink couldn't be easier, let's get started!

How to make invisible ink with your own hands?


So, let’s prepare the things we need:

Milk or lemon juice;

Bread, black;

Fountain pen (or paint brush);

1. We will use black bread to make an inkwell. Take a piece of bread and cut it out small capacity, about 50 milliliters.

If you don’t want to use bread, you can use any other container. Bread is used to give this process a historical character, and to completely immerse yourself in that atmosphere.

2. Pour milk into the finished inkwell.

The ink is ready!

How to use invisible ink?


We take a sheet of paper, dip a pen in ink and write on a sheet of paper. Soon the milk will dry and the paper will turn white again. For convenience, you can pour the liquid into a syringe.

How to read invisible text?


Instead of milk, you can use lemon juice, the effect will be the same.

How to make invisible ink from potatoes?

This time, we will use completely different ingredients, we need:

Potatoes, 1 pc.;

And, of course, a sheet of paper, a feather and a candle.

Let's get started!

1. Take a potato and cut out an inkwell from it. We don't throw away the leftovers!

2. We grate the trimmings and place them in cheesecloth. Then squeeze all the juice into our inkwell.

How many times in childhood did we read adventure books about Tom Sawyer, Electronics, Timur and his team. How they loved these cheerful and mischievous boys. Well, who hasn’t imagined themselves as a book hero, a pirate or a spy? They played war games, hide and seek, catch up, Cossack robbers. As we grew up, we began to forget how great it is to retain that genuine and radiant joy of a child. In this article we would like to invite you to plunge into your barefoot childhood and make invisible ink at home. You must definitely involve your children, brothers, and sisters in this fun process. The more people, the more fun the process.

Invisible ink

So, we will make ink, but not simple, but invisible! Interesting? Then we prepare everything we need.

We will need:

  • half a large lemon;
  • water;
  • tea spoon;
  • soup plate;
  • cotton buds;
  • paper;
  • desk lamp.

After we have prepared everything, let’s start our “chemistry”. Squeeze lemon juice and add one teaspoon of water to a deep plate. Mix the water well with lemon juice and dip a cotton swab into the mixture. Now write your message on white paper, wait until the message is completely dry and completely transparent. Now comes the fun part. To read this message, you need to heat a piece of paper under a table lamp, and it will reveal the message.

How did it work? Because juice is a "consequence" organic chemistry, then one of its properties is to produce a brown tint when the temperature rises. Then diluted with water so that our message instantly dries and disappears from sight.

Second way

This time we will do without lemon, but we promise that the effect will pleasantly surprise you.

So, we will need:

  • gauze;
  • grater;
  • young onion, one small head;
  • paper;
  • water;
  • soup plate;
  • teaspoon;
  • desk lamp.

Recipe

Grate one head of young onion onto a fine grater. Now take a gauze and put grated onion in it, squeeze out the juice. Mix the resulting juice with water, the proportion is one to one, stir in a deep plate. Write the text with a brush and let it dry for about twenty minutes. Now bring it to table lamp, wait a minute and read what you have in mind. The onion juice in this experiment can be replaced with orange juice, as well as milk. Milk always makes good ink.

Option with soda

In our home “chemical laboratory” we will consider several more options. So, the soda option.

For this we need:

  • baking soda;
  • toothpick or cotton swab;
  • water;
  • White paper.

Mix the composition in equal proportions baking soda and water. Using a cotton swab or toothpick, write text on paper using the mixed solution as ink. Let the lettering dry for ten minutes. Now you can view it, as in the previous methods, under a lamp. And you can make the experience much more interesting. Take black grapes and squeeze the juice out of them. Paint all the white paper with this juice and wait five minutes. And, lo and behold, you will see a bright contrasting inscription that appears before your eyes.

For those seriously interested in invisible ink and adventure games, you'll love the ways in which a huge range of different chemicals can be used as the basis for mysterious data transfers. Many substances are suitable for such games, but advanced spies simply need to be aware of the effects of acid.

You can read almost all invisible texts if you apply acid to them (for example, lemon juice). Well, as you concluded from the options discussed, most letters open when heated. So before you get ready for a hike, a secret mission or reconnaissance, be sure to take a source of light, heat and acid with you. Also, before an important task, don’t be lazy to run into the laboratory, because the agents have already prepared magic drugs for you.

List of magical developers:

  • a pile of washing powder;
  • phenolphthalein (reacts with soda, due to which it manifests itself beautifully);
  • apple cider vinegar or acid (reacts with red cabbage juice and develops colorless ink);
  • table salt (silver nitrate is enough to read messages);
  • copper sulfate (you will need sodium iodide or ammonium hydroxide);
  • ferrous sulfate (reacts only with soda);
  • corn starch (you need iodine solution to read).

So we have looked at the simplest and most entertaining ways to make invisible ink. We hope you found a lot useful information and now the impressions from the experiments will remain in the memory for a long time.

Video on the topic of the article

Thematic selection of videos:

How to make invisible ink? There are a number of ways to do this. With the most popular available options Let's take a look at the presented material.

What is invisible ink

Invisible, or sympathetic, ink are specific solutions that are used to secretly display information on plain paper. In order for the inscriptions to appear, the use of a catalyst is required, be it chemical substances, warmth, light, etc.

This method of transmitting secret data was widely popular back in the last century. As a rule, a secret message was written on ordinary white paper with sympathetic ink. Then, plain, visible text of arbitrary content was written on top with a regular pen. Such letters were usually heated, the secret code was studied, and then the paper was sent to the fire.

Today it is possible to make invisible ink using ultraviolet light, or more precisely, fluorescent inks, which are used to create watermarks. Such substances make it possible to carry out high quality printing on banknotes, documents, strict reporting forms. Under normal conditions, fluorescent dyes remain invisible. They appear only under the influence of ultraviolet radiation.

There are a whole host of options for preparing fairly effective solutions for creating secret inscriptions. We'll look at common ways to make invisible ink below.

Invisible ink made from lemon juice

How to make invisible ink at home from regular lemon juice? To do this, you need to squeeze the liquid from half the fruit into a container, add a few drops of water and mix the resulting composition thoroughly. Then you should soak a cotton swab in the solution and write a message on paper with it. Finally, all that remains is to dry the secret letter.

Lemon juice is essentially a fairly concentrated acid. Substances of this nature change color to a darker color when exposed to high temperature. In order for the text written with lemon juice to appear, you need to lightly iron the paper with an iron or hold it over a candle.

How to make invisible ink from copper sulfate

Copper sulfate dissolved in water gives a substance of a pale blue, barely noticeable hue. Therefore, the presented substance is excellent for creating invisible messages.

How to make invisible ink using copper sulfate? To do this, you need to dissolve a small amount of the powdery substance in plain water. Next, using the same cotton swab or match, you can begin to apply the message to paper.

How to reveal information from a secret letter? In order for what is written to become visible to the eye, it is necessary to hold the paper for some time over a container filled with ammonia. The vapors of the latter will enter into a chemical reaction with copper sulfate. The result will be the appearance of distinct letters in a bright blue hue on the paper.

How to make ink from rice water

Rice water contains a significant concentration of starch, which, after drying on paper, does not leave clearly visible marks. To develop a message written with liquid from rice water, it is enough to moisten the paper with a non-concentrated iodine solution. The result will be the appearance of distinct blue text.

Invisible ink made from baking soda

How to make invisible ink from baking soda? The presented substance must be diluted in water to obtain a sufficiently saturated solution. Next, you can start creating your message. To write inscriptions on paper, you can use any convenient object at hand.

Before you start developing your letter, you need to let the invisible ink dry thoroughly. In order for secret inscriptions to be visible, the paper must be exposed to heat. Here you can use a hot iron, hold the sheet over gas stove or a candle. After about a minute, previously invisible inscriptions will begin to appear and will have a brownish tint.

Invisible ink made from milk

This method is one of the simplest and most accessible. To create secret messages, you just need to dip a cotton swab in milk and write on paper. Next, just let the sheet dry and smooth it on a hard surface.

To reveal the information, you need to hold the letter under light bulb. Since milk is heated much slower compared to paper, this will allow the hidden message to emerge.

Finally

So we found out what available methods exist for making invisible ink at home. Use any of the above solutions to play spy with your child or exchange secret letters with friends.

Invisible ink is a collective name for compounds that, once applied to paper, are invisible to the naked eye and appear after treatment with reagents or changes in temperature. Similar writing instruments were used in diplomatic correspondence and intelligence.

Below are simple recipes, available to all novice spies and conspirators. Ingredients needed can be found in every kitchen, found in any chemical kit, bought at the nearest pharmacy.

Read also:

Invisible ink recipes

So, what can we do with our own hands at home? And a lot of things!

Cow material

Pour some milk into a glass. Secret message write with a thin brush or cotton swab, V as a last resort A toothpick, a feather, or a regular sliver will do.

Having entrusted information to a piece of paper, it should dry thoroughly, preferably without resorting to direct sunlight: Ultraviolet light is harmful to spy secrets. After making sure that the milk is dry and invisible on the paper sheet, you can send it to your accomplice.

You can make text visible by heating the paper. In our hasty times, this is usually done using an iron.

Sometimes a secret document is put in the oven, heated near a light bulb, and if the message is not so urgent, it can be placed on a warm radiator. True fans of spy traditions use a candle flame and nothing more.

"Juicy" ink

After cutting the lemon, squeeze the juice into a cup, add a few drops of water, and stir. In a similar way we can use fresh apple: having grated the fruit on a fine grater, squeeze out the juice we need. If you don't have an apple, you can take an onion.

You will have to experiment a little with the ratio of juice and water: if the concentration of acid in the composition is too high, the fresh inscription will stand out against the background of the paper and will no longer be secret, otherwise the developed text will turn out unclear.

The time spent is repaid by the ease of use of the resulting solution: if you are too lazy to fiddle with brushes and sticks, you can pour it into a fountain pen. After writing, dry. Develop by heating the paper.

Rice to work!

The ancient Chinese once again confirmed their status as the wisest people on the planet by combining the exciting and therefore energy-consuming process of writing a secret message with cooking.

Thick rice porridge was cooked in such a way that some of the liquid remained on the surface without being absorbed into the rice. Dipping a brush into this liquid, they wrote a message. After completing the work, the narrow-eyed spy wiped the sweat from his forehead, left the paper to dry, and, raising his head, a short prayer Buddha, began to eat.

The “delicious” recipe for invisible ink did not remain a Chinese monopoly for long; it was soon borrowed by scouts from the islands lying in the east.

So the young spy, devouring another portion of porridge left after a secret writing session to the delight of his mother, can rightfully consider himself a successor to the ninja traditions.

In ancient times, the “rice” inscription was developed by heating the paper. But the white-faced devils came up with an innovation here too: they began to cover the leaf with iodine. The text now appears more clearly.

Time-honored invisible ink recipes are listed. Let's move on to more modern methods in the style of James Bond.

Other recipes

There are other options for making ink. We have a dime a dozen craftsmen!

From... soda

Mix water and soda in equal proportion. We apply the text to paper and dry it in the shade. It is curious that the usual heating for developing text will not help, you should resort to help grape juice. By applying the juice with a brush over the entire surface of the leaf, we can read the message.

Starch

Add one part water to two parts, stirring, heat the resulting mixture over low heat, let it cool. Apply the text with a toothpick, match, or any wooden stick.

For manifestation cover the paper with iodine. The leaf will take on a delicate purple hue. The inscription will be dark purple.

Vitriol

Add a couple of pinches of copper sulfate to a glass of water, stir thoroughly until the crystals are completely dissolved. Apply the inscription with a brush, a cotton swab or a fountain pen filled with a solution. Dry in the shade. For manifestation hold the leaf for some time over a container with ammonia, under the influence of the vapors of which the text will turn blue-green.

Instead of washing

Dilute regular bleach with water washing powder, make an inscription, dry it in the shade. The text can only be seen under the light of an ultraviolet flashlight.

We use aspirin

Dissolve in water a regular aspirin tablet, and invisible ink is ready. We apply the text and dry it. You can read the message after treating the paper with a solution of iron salts, which are found in powder form in almost every chemical kit.