Today, I did the experiments for this week which was on making invisible ink. During the Wednesday meeting, I was challenged by Eleanor to make a hypothesis on what will happen if different liquids were used. A hypothesis is a guess or prediction in science, and when it comes true, the hypothesis becomes a thesis. If a hypothesis doesn’t come true, then someone’s believing in fantasy.
Before starting, I had joined early. Eleanor told me that we were making invisible ink, so I requested about onion. Then, Eleanor challenged be to do a little bit more experiments by testing whether stuff like onion juice and milk work or not, so I tested that today.
On the meeting, we (as in us the people who joined) were asked by Eleanor to write in the comments on some things that may work other then lemon juice. Someone write soap. I wrote stuff like milk and onion. Eleanor suggested vinegar, fruits and probably sour, acidic stuff. She also explained that this is called oxidation. Eleanor described it as the brown in the apple.
The original experiment was using lemon juice, create an invisible picture or writing secret code that disappears, because when lemon juice dries up on paper, it disappears and becomes invisible to the naked eye. What I did as my experiment was drawing with different liquids. I used four different type of liquids. They are lemon juice, milk, onion juice and vinegar. All of them disappeared after drying up.
I tried to use the sun with a magnifying glass to heat up the paper and make the invisible ink reappear. The sun did not work well for all of them. The lemon and onion juices faintly appear under the sunlight and magnifying glass.
I also made another experiment with another sheet of paper which I tried to make the messages reappear with a candle or flame. The results were quite good, but the vinegar didn’t show in the sun or with the flame. Onion juice gave out a delicious fragrant which smells really good, and it made me so hungry that I wanted to eat the onion part of the paper.
In conclusion, sunlight does not work well even with a magnifying glass. Please do not do this test with the magnifying glass without any adult supervision because I managed to set the paper smoking and burn a hole on my piece of paper. I ended up doing two sets of experiments both under the sun and with the flame. These are some photos of my experiments.




How do you communicate a secret message to someone in this modern day world?