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Invisible Ink
How do I make invisible ink with a paintbrush, lemon juice, and light?
I was trying to make a secret code with invisible ink to my friends, but idk what to do with just the tools I have....
http://chemistry.about.com/cs/howtos/ht/invisibleink3.htm
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How to Make Invisible Ink
How to make invisible ink?
I was reading a book in science class from the shelf and it had science fair ideas in there. I saw "how to make invisible ink" and i wrote it down. But i abbreviated the elemets i had to get. one of them i abbreviated "SH" it was soudium something? and you mixed it with i forget what. but then you write whatever you want and then to get it to show up, you put alcohol on it....any idea what two things i mix together???
There are at least two methods to use baking soda as an invisible ink. Mix equal parts water and baking soda.
Use a cotton swab, toothpick, or paintbrush to write a message onto white paper, using the baking soda solution as 'ink'.
Allow the ink to dry.
One way to read the message is to hold the paper up to a heat source, such as a light bulb. The baking soda will cause the writing in the paper to turn brown.
A second method to read the message is to paint over the paper with purple grape juice. The message will appear in a different color.
Tips:
If you are using the heating method, avoid igniting the paper - don't use a halogen bulb.
Baking soda and grape juice react with each other in an acid-base reaction, producing a color change in the paper.
The baking soda mixture can also be used more diluted, with one part baking soda to two parts water.
Grape juice concentrate results in a more visible color change than regular grape juice.
What You Need:
Baking Soda
Paper
Water
Light Bulb (heat source)
Paintbrush or Swab
Measuring Cup
Purple Grape Juice (opt.)
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