Invisible ink?

Question

hi all !

my friend got an invisible ink from somewhere.

it was blue and when you spill it on clothes , it disappears after 3-4 minutes...without leaving any blue stain!

do you know how to make it at home?

if not..you can even tell me about any other invisible ink

thanks!

Answer 1

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.)

Answer 2

Write on a paper with lemon juice and dry it. Nothing will be visible. When you want to read it, dip in water and make it wet.You can read it like a water mark