How to create invisible ink. How to make invisible ink? Common Ways

Recipes for making invisible ink. Ways of their manifestation.

Cryptography appeared in the first century BC. These were the secret records of the pharaohs. Since then, much has changed in cryptography. They began to use for this not only the juice of plants and milk, but also specially designed chemical inks. Basically, this type of secret writing is aimed at diplomatic negotiations or secret correspondence.

Sympathetic inks are special compounds that, when applied to paper in normal conditions become invisible. Under certain conditions, entries appear. This can be both treatment with reagents and a change in temperature. These inks often develop when heated. Initially, this method was used for secret correspondence. Now this is a kind of shorthand method.

Such ink is quite simple to make at home. Such experiments will be interesting for children. First of all, you need to figure out what you are going to make ink from. There are many components and options.

Ink options:

• Milk
• Cobalt
• washing powder
• Lemon juice
• Aspirin

These inks are manifested by salts that contain iron. It can be bartholite salt or iron sulphate. The recipe for making ink is simple.

Instruction:

• Dissolve an aspirin tablet in 20 ml injections. It is better to turn it into powder initially
• After that, dip a brush or toothpick in the liquid and write a letter
• Let it dry completely, you can put it in an envelope

Surprisingly, invisible ink can be made from lemon juice.

Instruction:

• Squeeze some lemon juice into a bowl and add 5 drops of water
• After that, dip a cotton swab into the juice and write a letter
• Let the juice dry completely. Keep away from sunlight
• The ink needs to be slightly warmed up to develop. This can be done with an iron or a light bulb.

Inscriptions made in this way can be viewed using UV light. A fluorescent lamp or flashlight will do.

Instruction:

• Dissolve 10 g of washing powder in 100 ml of water. Mix the ingredients very carefully.
• It is necessary that the grains of the powder dissolve
• Dip your brush in the solution and write on the paper
• Dry without using the sun

This ink was used by the ancient Chinese for inscriptions.

Instruction:

• Boil rice in water. Can you make porridge out of it?
• After that, moisten the brush in a viscous broth and apply the inscription
• Let the letter dry in the shade
• Use iodine to develop ink
• In places of inscriptions, it will turn blue, since rice contains starch.

This is the most good recipe, as the inscriptions after development become bright and saturated.

Instruction:

• Dissolve a pinch of cobalt chloride in 20 ml of water
• Stir the solution thoroughly and soak the brush in it.
• Apply the lettering to the sheet and let it dry completely.
• In order to develop the inscription, it is necessary to heat the letter with an iron or a light bulb.

An easy way from a product that is available in almost every refrigerator.

Instruction:

• Pour some milk into a glass and dip your brush into it.
• Write on paper and let dry.
• Do not dry in direct sunlight
• To develop, the letter needs to be heated.

For applying beeches, a concentrated solution is used.

Instruction:

• Boil water and dissolve 10 g of sodium bicarbonate in 100 ml of boiling water
• It is necessary to achieve complete dissolution of the crystals
• Dip a wand into the cooled solution and write secret information
• Dry the paper in the shade. Heat the letter to develop

These are special inks, as they are visible at first, and after 1-2 days they completely disappear.

Instruction:

• In half a teaspoon of dextrin, we introduce 30 ml of a solution of iodine in alcohol, and pour it through gauze folded several times
• Filtered "ink" of blue color now write information
• In a day, thanks to the volatility of iodine, the text will completely and irrevocably disappear.
• To make the inscription visible again, go over the paper with a swab dipped in iodine solution.

This method was used in the Middle Ages. Also, the method was popular among the inquisitors.

Instruction:

• Add a pinch of copper sulfate salt to 30 ml of water
• Achieve complete dissolution of crystals
• Dampen the brush with the mixture and apply the inscription
• Let the solution dry in a shady area.
• To develop the inscription, hold the sheet over ammonia
• Due to the formation of ammonium salt, the inscription will turn blue

Milk, cobalt chloride and lemon juice react to heating.

Instruction:

• Put the letter on a clean sheet and cover with another white sheet.
• Heat the sheet with an iron
• You can develop a letter using a light bulb
• Just hold a sheet of paper over a lamp or table lamp

How to make an invisible ink pen? How to refill a pen with invisible ink?

You can use a ballpoint pen or fountain pen for this. With a pen, everything is simple. It is necessary to pour one of the secret solutions into the ink compartment and boldly start writing.

Instructions for making an invisible ink pen:

• Take a ballpoint pen with ink that has run out of ink.
• Rinse thoroughly with alcohol, after removing the metal rod
• It is necessary to achieve complete evaporation of alcohol and the purity of the metal nozzle
• Install the nozzle in place, and pour invisible ink into the tube using a syringe
• You can start writing

As you can see, with the help of simple manipulations, invisible ink can be made. This will amuse your children.

VIDEO: Invisible ink

Invisible ink is a solution for writing on paper. Initially, the inscription cannot be seen, but until some kind of chemical treatment is applied to the ink. There are many different recipes for invisible ink, but most of them still leave marks on paper that can be seen with the naked eye. Today we will prepare real spy invisible ink that cannot be seen before manifestation.

How to make invisible ink from baking soda

To make invisible ink we need:

• water;
• the spoon;
• writing instrument (toothpick or cotton swab);
• writing paper;
• candle or other heat source.

Stirring constantly, pour soda into warm water until it stops dissolving. We dip a cotton swab into the solution, wring it out a little to remove excess liquid and write our secret message. It's that simple!

Cooking invisible ink with blue vitriol

We prepare a weak, slightly bluish solution of copper sulfate and write with a stick, dipping into it, on paper. After drying, the inscription is almost invisible. To develop the inscription, you need to hold a sheet of paper over an open vial of ammonia. When it appears, a blue-green inscription is obtained. It is an ammonia complex of copper, obtained as a result of a chemical reaction.

Ammonium Chloride Invisible Ink Recipe

We will need quite a bit (on the tip of a knife) of ammonium chloride (ammonia). Add a teaspoon of water to it. Ready! The resulting solution can be used for secret writing. Invisible ink also appears with heat.

Cobalt Chloride Invisible Ink Recipe

Perhaps the most effective recipe for invisible ink includes cobalt chloride and water. And it is remarkable in that after drying on paper, the solution is almost invisible to the naked eye. Highly dilute cobalt chloride forms a pale-pale crystalline hydrate color pink, which visually merges perfectly with the white sheet. But after heating, bright blue letters appear on the paper! However, if the paper sheet is moistened, for example, by holding it over steam, then the letters will disappear again, because a crystalline hydrate is formed.

invisible ink - The best way masking important text. Some still remember how, under the Soviet Union, Lenin managed to convey important statements from prison to his comrades-in-arms, on the sheets of an ordinary art book. Making invisible ink is easy, let's get started!

How to make invisible ink with your own hands?

And so, we will prepare the things we need:

Milk or lemon juice;

Bread, black;

Fountain pen (or brush for paints);

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

If you do not want to use bread, you can take any other container. Bread is used to give this process a historical character, and to fully immerse yourself in that atmosphere.

2. In the finished inkwell - pour milk.

Ink is ready!

How to use invisible ink?

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

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:

Potato, 1 pc.;

And, of course, a piece of paper, a pen and a candle.

Let's get started!

1. We take a potato and cut out an inkwell from it. Don't throw away leftovers!

2. Grate the scraps and place in gauze. Then we squeeze all the juice into our inkwell.

Well, who in childhood did not invent secret ciphers? It's so interesting to send a message to a friend that none of the "enemies" can read 🙂 My daughter and I decided to play spies and did it ourselves invisible ink .

And it all started with a magic box Superprofessor. Qiddycome. A series of the best chemical experiments: "Fire ink and prank succeeded" .

invisible ink

Invisible or sympathetic ink - These are liquids that, when written, do not leave a colored trace on paper. You can read the inscription only by processing the paper in a special way.

How to make invisible ink was described by Philo of Alexandria in the 1st century AD.

"Invisible milk powder ink" - experiment #1

At times Russian revolution secret messages were often written in ordinary letters between the lines. It was the simplest invisible ink.

To make them you need to take:

• dry milk - 1 tsp
• water - 50 g
• piece of paper
• brush
• iron (or candle, or table lamp)

The course of the experiment "Invisible ink" - method number 1

1. Dissolve milk powder in water by stirring thoroughly.

2. Dip the brush into the resulting solution and write a secret message.

3. We are waiting for the invisible ink to dry. For greater secrecy, we write a deceptive text with a regular pen and send a letter.

4. To read the letter, you need to hold the paper over the lamp or iron it.

It turned out that writing with invisible ink is very difficult - they are really invisible 🙂 For reliability, I had to trace the letters blindly, so the inscription is fuzzy.

"Invisible Fresh Milk Ink" - Experiment #2

Olesya and I experimented and tried to write a message with regular milk (3.2% fat).

The result is almost the same as with the use of powdered milk, just do not bother with the search for powdered milk. If there is a "cow" - it's easy to write a secret message 🙂

"Invisible Copper Ink" - Experiment #3

This ink is more difficult to prepare, because you have to look for the ingredients:

• copper sulphate powder - 1. tsp. (5 mg)
• ammonia
• water (50 g)
• stick for stirring
• paper and brush

The course of the experiment "Invisible ink" - method number 3

1. Add copper sulfate powder to the water and mix thoroughly with a stick until a pale blue solution is obtained.

2. We dip the brush in a solution of copper sulfate and write a secret message.

3. We wait until the invisible ink dries and send it to its destination.

4. To read the secret message, pour 10-15 ml of ammonia into a glass and hold the paper over the glass until the invisible ink turns blue.

Since the ammonia “smells” very strongly, we tried to iron the message from invisible ink with blue vitriol. The letters also appeared, although not so clearly:

"Invisible Soda Ink" Experiment #4

This experiment can also be carried out in an ordinary kitchen.

For him you will need:

• warm water
• the spoon
• paper
• cotton swab
• iron (lamp or candle)

The course of the experiment "Invisible ink" - method number 4

1. Dissolve soda in water.

2. Dip a cotton swab in the soda solution and wring it out slightly.

3. Leave the message alone until completely dry.

4. We iron the paper or heat it over a lamp (candle)

Invisible soda ink gave a great result - perfect drying and excellent development of the letter.

Our impressions of invisible ink

Half of our kitchen was covered with drying secret messages:

And these are our secret letters already revealed:

Most of all we liked soda invisible ink . They dry quickly and are completely invisible. When the messages are heated, the writings with this ink are clearly visible.

Messages from copper sulphate unpleasant to show due to bad smell ammonia. We tried to develop them using an iron - it turned out 🙂 And yet, we liked such invisible ink because of its easy development. In our ranking, they are in 2nd place.

Messages from fresh and dried milk dries to a slight sheen. When ironing, they appear heterogeneous. We ranked the invisible ink from fresh milk at 3rd place (availability), and the ink from powdered milk at 4th place.

That's how we learned to do with my daughter invisible ink . Now it's up to friends - we will teach them and we will exchange secret messages.

And you can also see VERY interesting chemical experience by volcanic eruption.

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

The following are simple recipes, available to all novice spies and conspirators. The necessary ingredients 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. We write a secret message with a thin brush or cotton swab, in extreme cases, a toothpick, feather, or an ordinary sliver will do.

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

You can make text visible by heating the paper. In our hurried times, this is usually done with 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 put on warm battery. 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, mix. Similarly, we can use a fresh apple: after rubbing the fruit on a fine grater, we squeeze out the juice we need. For lack of 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 cease to be secret, otherwise the developed text will turn out to be fuzzy.

The time spent pays off with 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. Dry after writing. Develop by heating the paper.

Rice in action!

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 cooked in such a way that part of the liquid remained on the surface without soaking into the rice. By dipping a brush into this liquid, they wrote a message. After completing the work, the narrow-eyed spy wiped sweat from his forehead, left the paper to dry, and, raising short prayer Buddha, took to the food.

The “delicious” recipe for invisible ink did not remain the monopoly of the Chinese for long, it was soon borrowed by scouts from the islands to the east.

So the young spy, who, to the joy of his mother, absorbs another portion of porridge left after a session of cryptography, can rightfully consider himself a successor to the traditions of the ninja.

In ancient times, the "rice" inscription was shown by heating the paper. But the white-faced devils came up with an innovation here: they began to cover the leaf with iodine. Now the text appears more clearly.

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

Other recipes

There are other options for how to make ink. Craftsmen we have a dime a dozen!

From ... soda

Mix water and baking soda in equal proportions. We put the text on paper, 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. Applying the juice with a brush over the entire surface of the sheet, we can read the message.

starch

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

For manifestation cover the paper with iodine. The leaf will become tender purple hue. The lettering will be dark purple.

vitriol

Add a couple of pinches of copper sulfate to a glass of water, stir thoroughly, achieving complete dissolution of the crystals. The inscription is applied with a brush, a cotton swab or a fountain pen filled with a solution. We dry in the shade. For manifestation hold the leaf for some time over a container of ammonia, under the influence of the vapors of which the text will turn blue-green.

Instead of washing

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