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How does invisible ink work?

What do you think? How would you answer the challenge? It can be fun to think like a spy and figure out ways to send secret messages. One way to do this (and answer the challenge) is to use invisible ink.

One very simple form of invisible ink is heat activated. These inks can be made from many types of organic liquid. Once the message dries on the paper, it is invisible.

When the ink is exposed to heat, such as under an iron or over a candle flame or 100-watt light bulb, the acids in the liquid turn a different color and the message becomes visible. You can find many heat-activated invisible inks right inside your kitchen, including clear soda, lemon juice, apple juice, onion juice, milk, soapy water, sugar water, and vinegar.

Another type of invisible ink is chemically activated. Chemically-activated inks can be made from any two chemical substances that are colorless until mixed with one another. When the message receiver adds the second chemical developer, the chemical reaction between both substances causes the color to change and the message to appear. Vinegar alone can be heat-activated, but if you add red cabbage water instead of heat, it becomes a chemically-activated invisible ink.

A third kind of invisible ink is a favorite of amusement parks. Long ago, if you needed to leave an amusement park to go to your car, they would simply stamp your hand. When you returned to the park gate, as long as you had the stamp, you didn't have to pay to come back inside. These ink stamps were easy to copy and allowed people to sneak in without ever paying for a ticket.

Today, many amusement parks use light-activated invisible inks. If you need to leave the park, they will stamp your hand, but you may be surprised when you look down to find nothing is there. When you return to the park, they will ask you to put your hand under a special light, and just like magic, a glowing stamp imprint appears.

Light-activated inks work because they contain substances that glow under different types of light, but remain invisible to the naked eye. This means no big, ugly stamp marks on your hand and no more free admission for anyone trying to sneak in. Examples of light-activated invisible inks include laundry detergents containing brighteners, soaps, and human saliva.

Invisible ink may not be obvious to the naked eye, but pen scratches and abnormalities on the paper can be telltale signs of its presence. Some inks are easier to develop than others, which means anyone with knowledge of invisible inks may be able to decode your message.

For example, let's imagine you use soapy water to write your message. If someone found your paper, they might use heat, chemicals and ultraviolet light. Since soapy water is reactive to each of these, it wouldn't take them long to reveal your top-secret message.

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Name: azhagesh IP: 42.111.131.57 Time: 2018-08-07 17:17:41
Content: I want to change ordinary deck of playing cards to barcode marked cards by my own. so pls can u explain the way to perform this. pls inform me the procedures and also about the expenses for this.
Admin_reply: Thanks for your inquiry about barcode marked cards, I have sent you the email, please check and reply, thanks
Name: Mike IP: 24.193.189.86 Time: 2018-07-31 17:04:21
Content: Looking to purchase the contact lenses for blue eyes the goo ones. Also I’m looking to purchase Copag blue and red plastic poker cards marked with the invisible ink. Please let me know cost for both and also shipping time and cost. I can order on regular basis because I resell. Regards Mike
Admin_reply: Thanks for your inquiry about contact lenses for blue eyes and Copag plastic marked poker cards with invisible ink, I have sent you Whatsapp message, please check and reply, thanks
Name: Adam IP: 148.75.180.139 Time: 2018-06-03 13:11:41
Content: Hello , I am looking for a pair of  Tapper mercury dice. I collect dice amd would like a set for my collection. there currently seems to be no such dice on the market currently , but I do know they exist. Can you / do you create such dice ? I am looking forward to your response.
Admin_reply: Thanks for your inquiry about mercury dices, I have sent you email, please check and reply, thanks

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