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Invisible Ink Essay

Ink is a liquid containing pigment or dye, ink is used for writing or drawing. The following is my invisible ink essay for you.

Article 1: Interesting "Invisible Ink"

As we all know, there are many spies in spy movies, how do they get the information? They write letters through invisible ink in the form of revealing confidential information. Invisible ink is really so magical? Can you make it yourself? The first thing you need to do is to make sure that you can make it yourself.

The teacher of the Science and Technology Center introduced the principle of invisible ink, and invited a few reporters to do a demonstration on the spot, and explained several ways to do invisible ink. The table prepared tools as well as materials, please small reporters and parents to do the experiment together.

I first use a fruit knife to lemon everything for two, half a lemon broken into the juicer, dad pressed the switch for a while to squeeze out a cup of delicious lemon juice, dad told me to the lemon juice to some water and stir, I do a good job of preparation. Began to write formally, so I brought a piece of A4 printing paper, put the cotton swab into the cup dipped a few drops of lemon juice, in the white paper while writing "I love you, Dad" the words, while carefully observing the lemon ink changes. Huh? I can still see the words. What? I was shocked, I had failed. When I was regretting, my dad reminded me to dry the paper. After drying, my father rushed to light a candle, I slowly put the paper on top of the fire, hold my breath and move back and forth evenly. Look, something magical happened, the words showed up, it was unbelievable. "Yay, we did it!" I said to my dad with a smile. Dad was so happy that he praised me for being a little spy.

Why is that? Dad touched my head and smiled and said, "Lemon juice contains organic compounds dissolved in water, almost colorless, when heated it will decompose and turn brown, and the handwriting on the paper shows it." This experiment is really interesting, so that I understand the water lemon juice can be used as "invisible ink" role.

Part II: Invisible ink

Recently, my grandfather and I are obsessed with a spy movie, every day to see a while, today, I look at the time I found that the inside of the spy and another spy need to write a secret letter, it will be able to use a kind of ink can be invisible to write, the other spy received the letter to the fire a bake, write the word on the show, it is really magical.

So I asked my grandfather, what is this all about? Grandpa smiled and replied: "This is because the spy took lemon juice. Lemon juice coated in the paper will be a chemical reaction with a substance on the paper, generating a similar to the "celluloid" material. The ignition point of this substance is lower than the ignition point of the paper, so when it is roasted over a fire, the area that was coated with lemon juice will be scorched first, so the words written with lemon juice will naturally show through." "Oh, I see. By the way, Grandpa, there's a lemon left at home, let's write secret letters too."

"The materials for writing a secret letter are very simple, all you need is some lemon juice, a piece of white paper, a cleaned or new fountain pen, and some matches or a lighter." Grandpa was very excited and said so much in one breath. I do a good job of preparation, began to formally write a secret letter, I wrote on a piece of white paper with lemon ink, "study hard, every day up" these words, then Grandpa let me dry the lemon ink, dry, Grandpa rushed to light a lighter, I picked up the paper, back and forth on the fire, only to see slowly, the paper showed a few yellow words, "Yay, we did it!" I said to grandpa with a smile. Grandpa was also very happy, and praised me for being a little spy.

In life as long as we observe carefully we can get more wonders, more discoveries.

Part III: Invisible ink is really interesting essay

Our class, Mr. Du, took us to play, because today we scored 100 points in the class value weekly results.

Some flew kites, some jumped rope, and I made a bottle of invisible ink with orange juice. The class teacher made with lemon juice, I tried at home with orange juice, and lemon juice can be as invisible, with the fire grilled word also appeared. Don't look at the small ink nothing, can be God, poured on other people's clothes, after a while will not be able to see.

Other people in that kite flying, I was there to tease people, I said: "Look at me to pour invisible ink on the clothes, a moment on the gone." After a while, they took a look, really invisible! They said: "give me pour some, I gave them, they are very curious" got! Huang Jiaxin took the ink and poured it on Zhang Jingya's clothes when she wasn't looking, and we laughed behind her! Zhang Jingya but said they did not pour ink it, I said: "did not pour."

I had a really good time today!

The early summer sun shone on my face, and it was a little hot. I sat in the study while copying the beautiful text, while drinking cold lemon juice, pleasantly humming a little song. Suddenly, there was a "pop" and I accidentally spilled lemon juice on my book! It's over! I quickly wiped it with my sleeve, but it left a deep mark on my notebook. Gosh, my homework! I rushed to get a napkin and made sure to wipe it off. But by the time I came back with the napkin, the lemon juice had been dried by the wind and the deep mark was gone. Strange, why is it gone?

"Dad, how strange? Why is that mark gone?" I asked my dad in disbelief. After listening to my question, my father said with a smile, "This is an interesting phenomenon, you can go to check the "Youth Encyclopedia of Knowledge", and study it ah! See if you can find the mystery!" My spirit of adventure was suddenly ignited like a fire. What a marvelous scientific phenomenon! I went to the book with my doubts, to look for information, and soon I found it! The answer is written in the book ...... "Lemonade" - when you write with this "invisible" ink, you can see what you are writing. what you are writing. Once it dries, the writing is invisible.

I was a bit skeptical about this conclusion, even though I found it in a book. To confirm it, I tried an experiment.

I first got a piece of letter paper, a thick-nibbed fountain pen and a lemon fruit. I used the ink is this lemon juice, first cut the lemon fruit, with half of the lemon fruit to squeeze out a cup of delicious lemon juice, this is for their own successful experiments to celebrate the use of, and half used for ink. Then I pressed the pen hard into the flesh of the lemon so that the tip was saturated with lemon juice, but not too much, I was worried it would drip. Then I wrote a letter on the paper-a letter to my mother, whom I was going to surprise. I was using a lot of force to make the strokes as thick as possible. It gave the letter the effect of a mysterious treasure map in an adventure novel. When my letter was almost finished, the lemon juice was almost dry. I realized that the opening words had faded and were slowly and slowly becoming unreadable.

How was I to reproduce the imperceptible ink if my mother hadn't found the mysterious letter?

I tried to put the letter paper with the writing side down, in the weak candlelight with a little heat, the original writing on the paper can not be seen is gradually turning brown, show up, the letter can be read again. I was very careful when I did this experiment, for fear of burning the paper, otherwise what I had written would never appear!

I found that the mystery lies in: lemon juice is alkaline, has a reducing effect, can be the color of the pen on the workbook oxidation reduces to colorless, by the wind after drying, the formation of a kind of similar to the transparent film of the same material. So I can't see the deep marks. And paper is made of cellulose, which needs a higher temperature to be scorched. Lemon juice contains small molecules of carbon, which, when exposed to low heat in the air, scorches more easily than paper, turns brown, and the writing on the paper shows up again.

Suddenly, in my mind flashed another question mark, lemon juice drops on other paper (such as A4 printing paper, drawing paper) will be what it looks like, is not the same phenomenon?

My idea was praised and supported by my dad. So I got a piece of A4 printing paper, dipped in lemon juice ink, while writing, while carefully observing the changes in lemon ink. After about four minutes of swelling, the lemon ink on the A4 paper became lighter and lighter, and gradually disappeared. I also splashed ink on the drawing paper, the result is that my masterpiece in about three minutes, also disappeared without a trace. It seems that lemon ink and the "paper family" relationship is very good - it is easy to be invisible in it.

It turns out that science and life are so closely related! The Chinese 'history, culture and scientific knowledge is so vast and profound ah! Try to learn every subject, there are many mysteries in the future, waiting for us to discover, to explore it!

Article 5: will be invisible lemon juice ink

Sunday, I followed my mother's instructions to make ice lemonade. When I poured the lemon juice into the glass, I spilled it on the table.

I looked at the lemon juice on the table and thought, "I can't drink this, it's a shame to wipe it off with a rag like this. It just so happened that there was a bottle of toothpicks and a piece of white paper on the table. So I picked up a toothpick and dipped it in some lemon juice and wrote on the paper ', lemon juice ink," the words, but do not look closely, you can not see the words written on the paper.

After a while, my mom told me to put the wine I just bought on the table. I learned from the bartender on TV, shook the bottle up and down a few times, and accidentally spilled the wine on the paper. To my surprise, the words on the paper appeared. Wouldn't it be something if I could use lemon juice as ink? I excitedly got a new pen and filled it with my "lemon juice ink". During dinner, I said loudly, "Now Zeng Zixi, the little magician, is going to perform a show." Mom said, "What kind of magic can you do?" I took out the white paper I had prepared beforehand and asked my dad to say a few words in a decent manner. My dad said, "Study hard and learn every day." I took the pen filled with "lemon juice ink" and wrote the words with great force. Then I dipped my finger in some wine and sprinkled it on the paper on which I had written the words. In a short time, the paper appeared on the words "study hard, every day up".

Mom and dad were curious and asked me what was going on. I told them what happened. Dad patted me on the head and said, "Boy, good job!"

Part 6: Invisible Ink Experiment

Today I did an invisible ink experiment. The materials used are: milk, white paper, egg white, urine (their own), pens, candles, lighters, small plates. On a piece of white paper, write milk, egg white and urine with a pen, after which write a string of numbers on the white paper in pairs with each of the three materials, after which wait for drying.

Winter room temperature of 20 degrees, urine dries the fastest, egg whites are prone to air bubbles, 10 minutes later there are one or two particularly wet numbers did not dry, 18 minutes after all dry. Traces on the paper, urine's least obvious, egg white's most obvious, milk in the middle.

Light the candle with a water beater and secure it to a small plate with candle oil. Afterward, place the paper over the flame and move it evenly back and forth. Charred words appeared on the paper, milk and egg whites showed up faster in bright colors and urine showed up slower in dull colors.

To make a word clear, you have to put the word on the fire and wait a while, but this is very, very dangerous, it is easy to catch fire. No, my experimental paper on fire, the first thing I thought of was to use water to extinguish the fire, because I prepared a bowl of water long before I did the experiment. I said, "Mom, water, water!" Mom said, "Throw it on the floor." I thought, "It's a wooden floor, won't it catch fire if I throw it on the floor? My mom insisted that I throw it on the ground, so I had to throw it on the ground. I threw to the ground, only to hear "click, click, click, click" three, mom stamped out the fire with her feet, mom said this is the pressure to extinguish the fire. I was scared heart "fluttering fluttering" jumped straight, fortunately not over-heartbeat.

I know about the knowledge of fire, any material combustion, there must be three conditions: that is: combustible (such as paper), combustion aids (such as air) and the source of ignition (such as open flame). The basic measures to prevent fire and extinguish the fire, you can control the combustible material, isolate the combustible material, eliminate the ignition source, to achieve the purpose of fire prevention.