How does invisible ink work?

Answer 1

It depends on the type of ink used; there are several methods of using invisible ink and of finding them. The most common is to use a weakly acidic solution such as lemon juice; wipe this over the area thought to be hiding the ink and then heat it using a blowdryer, electric iron or oven on low heat. Another is to place the area under a UV light, as some inks will only show up under one.

Answer 2

To make an invisible ink you can do it right at home. If you mix semen from 2 different people (DNA must be different) with water and copper chloride. It makes the ink invisible. Test on paper and if still doesn't work add more water until it does. (Stir thoroughly)

Answer 3

you can make invisible ink with lemons and scewers, this is how you do it,

collect lemons and squeeze the juice out of it and then use your scewer and dip it in the lemon juice, write a message on a piece of paper and shine it with a torch or put it infont of the sun.

Answer 4

Hold the paper up to the light (like a window), you can slightly see where the paper got wet when you wrote. It should be a bit faded looking (i think [just the best description i could use]).

Answer 5

1. There are at least two methods to use baking soda as an invisible ink. Mix equal parts water and baking soda.
2. Use a cotton swab, toothpick, or paintbrush to write a message onto white paper, using the baking soda solution as 'ink'.
3. Allow the ink to dry.
4. 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.
5. 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:

1. If you are using the heating method, avoid igniting the paper - don't use a halogen bulb.
2. Baking soda and grape juice react with each other in an acid-base reaction, producing a color change in the paper.
3. The baking soda mixture can also be used more diluted, with one part baking soda to two parts water.
4. 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

or

1. Squeeze lemons to obtain their juice or obtain bottled lemon juice.
2. Use the juice as 'ink' by applying it to a stick or paintbrush and writing on paper.
3. Allow the paper to dry.
4. When you are ready to read your invisible message, hold the paper up to sunlight, a lightbulb (recommended), or other heat source.
5. The heat will cause the writing to darken to a pale brown, so your message can now be read.
6. Another way to read the message is to put salt on the drying 'ink'. After a minute, wipe the salt off and color over the paper with a wax crayon to reveal the message.

Tips:

1. Experiment with other juices. White wine, Orange Juice, vinegar, and apple juice all work well, too.
2. A cotton swab makes an excellent disposable 'paintbrush'.
3. The writing turns brown because the weakened paper burns before the rest of the paper. Be careful not to overdo your heating and ignite the paper!

What You Need:

• Lemon or Lemon Juice
• Sunlight or Heat Source
• Paper
• Paintbrush or Stick

Answer 6

its the lemon juice, baking soda, or corn starch that reacts 2 heat or something.

Answer 7

The invisible ink is a compound (or mixtures) which become visible after a chemical reaction, or after heating, or after irradiation with an UV lamp.

Answer 8

from the lemon juice ext.