With the help of invisible ink, you can write any words and draw different pictures. But then they disappear! Surprise your friends at a party or birthday, write a secret note to a friend, or spend interesting experience with kids. There are many ways to make invisible ink.
Making invisible ink from lemon juice
Squeeze the juice from the cut lemon into a bowl. Add some water and stir. Let's test our ink:
- take a sharp small stick or thin brush. Well, if there is a pen with a pen;
- dip your wand in ink and write something on a white piece of paper;
- let the inscription dry - the message will become invisible;
- iron the invisible inscription on the sheet with an iron, the ink will begin to appear.
You can hold a sheet of paper over a lit candle at a distance of 10 cm - a similar result will come out. The lettering will be brown. The same dark inscription from invisible ink after heating will be obtained when using apple, onion and other juices with great content acids.
Making invisible ink out of milk
Pour some milk into a cup. Dip the stick in milk and write something on paper. Let the milk dry well on the sheet. To read the inscription, heat the sheet on a light bulb, over a candle, or iron it with an iron.
Making starch invisible ink
The ink preparation process is as follows:
- combine 2 parts of starch with one part of ordinary water;
- heat the resulting paste over low heat, stirring all the time;
- let the paste cool;
- write with a cotton or sharp wooden stick with cooled ink words on paper.
For the manifestation of words, grease the sheet with an aqueous solution of iodine. The paper turns light purple. And the words that emerge from the ink will turn dark purple.
Making invisible ink according to an old Chinese recipe
Ancient Chinese emperors used rice water for secret messages. Cook a thick rice porridge. Be careful that the rice does not absorb all the liquid. Use this water as invisible ink. Write a message on paper. To develop the inscription, grease the paper with an aqueous solution of iodine.
Making invisible ink from baking soda
Prepare:
- water;
- grape juice;
- baking soda.
Combine water with soda in a one to one ratio. Mix them well in a bowl and you have a soda-based ink. Put them on paper, but heating will not help to reveal the secret message. Use grape juice. Dip the brush in the juice and paint the paper until the inscription appears.
Instead of an iron, a candle or a light bulb, you can use an oven to heat the sheet. Place the secret message in a hot oven and wait a few minutes for the message to manifest. Invisible inscriptions appear on a sheet when heated because the ink substance chars faster than paper.
Remember safety precautions when developing a message on open fire! Prepare a saucepan ahead of time. cold water. In it, you will put out the leaf if it accidentally catches fire.
Choose any ink recipe and surprise your friends or play spies. Even secret agents of Ivan the Terrible wrote their messages to the tsar with onion juice, and no outsider could read the message.
Some substances found in milk or lemon juice are destroyed by heat faster than the paper itself ignites. Wherein chemical process combustion products are released. Using this knowledge, you can make invisible ink for secret messages.
invisible ink
You will need:
White paper, brushes, pens or pipette, milk or lemon juice. (We even did it with apple juice). Candle for deciphering letters.
How to conduct an experiment:
- Pour some milk or lemon juice into cups. Take White list paper and pipette (or brush). Take some juice or milk into a pipette and write something on paper.
- Then let the paper dry thoroughly. The inscription disappeared and became invisible.
- Now put the candle in the center of the plate and light it. Take a dry piece of paper and hold it over the flame
candles at a distance of at least 10 cm. Constantly move the sheet back and forth so that it does not have time to catch fire.
In a few seconds, you will see brown letters and drawings that you have written or drawn appear on white paper.
Sympathetic (invisible) ink- this is ink, the records of which are initially invisible and become visible only under certain conditions (heating, lighting, chemical developer, etc.) Wikipedia.
Ink for secret correspondence, that is, sympathetic, was used in ancient times:
- Secret agents of Ivan the Terrible wrote their reports with onion juice. The letters became visible when the paper was heated.
- Lenin used lemon juice or milk for secret writing. To develop the writing in these cases, it is enough to iron the paper with a hot iron or hold it over a fire for several minutes.
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.
Q&A No. 20
Added: 12/05/2013
From time immemorial, almost immediately after the appearance of writing, people began to think about the possibilities of preserving the secrecy of correspondence. Of course best remedy Invisible ink was used to solve such problems. Cryptography, applied to paper with the help of special substances, made it possible to hide a lot of different secrets. A meaningless entry, visible to others and applied over the disappeared words, carefully kept its secret until a “craftsman” was announced who was able to read the text hidden between the lines.
Today, invisible ink, also called sympathetic ink, can be made at home. You can use this unique invention for various purposes, but in most cases, it is the basis of all kinds of pranks. For maximum masking of the notes with invisible ink, in order to hide the slightest hint of their presence, something else can be written on top of such a colorless text, for example, a poem by Pushkin.
There are several recipes for making sympathetic ink:
First way
In the old days, liquids were used as disappearing ink, which, after drying, did not leave the slightest trace on paper: white wine, beer, milk. To develop a recording made from the above "ink", you will need ordinary ashes. To enhance the effect, the paper can be lightly dampened by breathing before being treated with ashes.
Second way
Very good results can be achieved using swede juice, Apple juice, onion juice, citric acid. For the manifestation of messages written in such invisible ink, it is enough to hold a sheet of paper at a distance of ten centimeters from the fire. If you do not want to come into contact with fire, you can simply hold the paper under a hot iron.
Third way
Starch can also be used to make invisible ink. To read the inscription, the paper should be treated with a weak solution of iodine. As you know, under the influence of iodine, starch turns blue.
Fourth way
Ordinary washing powder can also be a good base for creating colorless ink. To read the inscription, just place it under the source ultraviolet radiation. As a rule, such lamps are used in nightclubs, solariums, devices designed to detect counterfeit banknotes.
Fifth way
Often in extreme conditions the role of ink was performed by ordinary saliva. A weak ink solution was used for development.
Sixth way
Using a syringe to inject a small amount of a colorless indicator of phenolphthalein into a goose quill, you get a good improvised pen. To develop the recording made by her, you need to use a swab dipped in any alkali (sodium hydroxide or potassium hydroxide). The letters will instantly acquire a crimson color.
Seventh way
You can write colorless messages with rice water. To develop the record, it is enough to process it with a weak alcohol solution of iodine. As a result, the letters turn blue due to the starch contained in the rice.
Eighth way
You can make notes on paper from a highly concentrated solution of cobalt chloride. Such text appears beautiful blue color when heated. Moreover, later such a record can be “forced” to disappear again. To do this, just breathe on it or hold it over the steam.
Ninth way
Dextrin and iodine will also help create disappearing ink. Dextrin is a substance obtained by heating starch. 3 grams of dextrin are added to 30 ml of iodine and passed through filter paper. The resulting blue ink write some text. After a couple of days, the record will disappear without a trace, and it will be impossible to restore it, due to the volatility of iodine.
Probably no longer in the kitchen, but on paper. Let's do handmade invisible ink.
It's great to use developing liquids for secret drawings, treasure maps, secret letters.
The first way is perhaps the most famous.
Invisible milk ink
Vlad could not write a letter with a brush, he can only handle it with a pen or pencil. This is the message I received one morning 
Therefore, they painted a landscape with milk, dipping a brush into it. After drying, they ironed it, and the writing became visible.
This was due to the fact that the protein contained in milk burns at a temperature much lower than paper. Therefore, when heated, the paper remains white, and the milk already darkens.
Lemon juice invisible ink
Another way to chemically encrypt messages is towrite with lemon juice.After drying, wipe with a cotton swab with iodine. In place of the letters there will be light places. This is how it is advised in the book, but in practice it was hard to see. The result was a drawing - Africans in Africa at night)))
This is a dad with his son and a truck on a string. We were not at all upset when we saw such a result. Great amused our grandmother with their creation. And then Vladik and his grandmother drew a joint masterpiece.
Grandpa was very similar! By the way, I read that felt-tip pens are also indicators and react differently to acids and alkalis. But in the course of our experiment, the spots from felt-tip pens blurred in the same way, either from a solution of soda or from vinegar.
But the Chinese emperor Qing Shi Huangdi (249-206 BC), during whose reign the Great Chinese Wall, used thick rice water for his secret letters, which, after the written hieroglyphs have dried, does not leave any visible traces. If such a letter is slightly moistened with a weak alcohol solution iodine, blue letters appear. And the emperor used a brown decoction of seaweed, apparently containing iodine, to develop writing.
And what kind of creative continuation of experiments would you offer your child. Share ideas in the comments and send photos of experiences and experiments from your home laboratory. Thank you for reading our posts and sharing them in in social networks. We try to make science fun for you.
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