As soon as the white paper is illuminated by the light bulb, it shows brown handwriting.
There are often classmates who often pester teacher Huang to ask about the tricks of magic, and Xiao Bunny is no exception, she originally liked to study small magic, and now with Teacher Huang's guidance, her progress is faster. Teacher Huang simply set up a magic interest group and let the little rabbit be the leader. This day is the first day of the interest group's activity, and the activity program is "White Paper".
The students sat around early and watched as Teacher Huang took a table lamp without a lampshade and connected it to the power supply and put it on the desk. Everything was ready, and the little rabbit did not hesitate to take out a piece of paper from his bag and show it to everyone. It was a blank piece of paper with no word written on it, and the little rabbit said that the words on it were written in "dark magic", and if you wanted to show the handwriting, you had to use "light magic". So she turned on the lamp in a similar way, and read the words to the lamp, and after a while, she put the white paper behind the bulb.
As the bunny read the words, the white paper really showed a faint brown handwriting.
Magic revealed
Props: 1 small cup of lemon juice, cotton swab, white paper, table lamp
Get ready
Write a few words on the paper with a cotton swab dipped in lemon juice, and then let the handwriting dry naturally, and after drying, the handwriting will be difficult to see. Fold up the written paper and put it in the envelope.
The performance process
(1) The magician walks onto the stage with a letter, opens it in front of the audience with a look of delight, and takes out the stationery that has been written in lemon juice beforehand.
(2) The magician opens the letter paper, finds that it is blank, pretends to be confused, and shows the audience the white paper. The magician pretended to think and decided to use magic to make the handwriting appear.
(3) Remove the lampshade of the lamp, put the white paper behind the bulb, start to cast magic and recite the words, at this time, the handwriting gradually emerges from the white paper.
Highlights
The table lamp can be placed on the stage beforehand and turned on. This ensures the temperature of the bulb. Note that incandescent bulbs must be used to perform, and "cold lights" should not be used. To avoid too harsh lighting, you can choose a matte bulb with a lower wattage.
Chemical principles
Lemon juice has carbon molecules that have almost no color when dissolved in liquids, but when they are heated, chemical reactions occur. Carbon-containing molecules will split and produce a new substance, carbon. The color of carbon element is brownish black, so the dried lemon juice turns brown after being heated.