Ways to create a stealth letter from the most basic items

Creating a stealth mail is a lot easier than you think, simply using things around.

It is easy to understand, "hidden" letters are letters written so that the average person can not easily read them, but through many special methods. For example, the situation of nylon letter written by the accused Thuy Dung in the case of beauty - the famous giant is currently a hidden form of mail.

However, the culmination of hidden letters is "invisibility" letters - the letters that looked over were no different from a blank sheet of paper, but the contents contained many contents that the writer did not want anyone to know, except for people receive.

In order to write invisibility letters, of course we need stealth ink.

In order to write invisibility letters , of course we need stealth ink . They are ink made from transparent compounds, written with bamboo toothpicks, cotton swabs, or even using fingers. The thing is, what you write is only due to some external factors, such as temperature, ultraviolet lights, or pH indicators.

This is complicated, but anyone can do these letters, because invisible ink can come from the things around you. And here's how to create such inks.

1. Invisible ink only appears when the temperature is active

Anything acidic can be used as an invisible ink. It's lemon juice, vinegar, baking soda, white wine, diluted honey, milk . You can even use . diluted urine as an invisible ink.

Anything acidic can be used as an invisible ink.

If you want to show it, grab a sheet of paper on the light bulb, or use it under the light of alcohol.

Why? Because acidity will weaken the structure of paper. Even when paper is dry, acid is still there. Under the impact of heat, the paper quickly turns brown before the entire sheet begins to catch fire.

2. Invisible ink only appears when there is an indicator

This is a level of invisibility at a higher level, because you have to know the instructions needed to show the ink, not simply fire. Typically, the indicator is of a basalt-based substance.

For invisible inks that are only visible when there is an indicator, this is a stealth ink at a higher level.

Of course, these chemicals are also harder to find, but in return the security is also superior. Some examples are as follows:

1. Phenolphthalein (pH indicator) and thymolphthalein - is displayed by ammonia or sodium carbonate (or other basal substances).
2. Copper sulfate and iron sulfate - shown by iodine, sodium carbonate.
3. Corn or potato flour mixed with baking soda - shown by iodine solution.

Use iodine solution to show invisible ink with corn flour.

3. Existing ink under ultraviolet light

In fact, most of the inks that are visible under ultraviolet light can be displayed under the influence of temperature.

1. Laundry soap diluted
2. Soda water tonic
3. Vitamin B-12 is soluble in vinegar.

Creating invisibility ink is not as difficult as you think.

* Note: You can "camouflage" the letter by overwriting another content with a ballpoint pen, pencil or wax pen. Do not use pens, because ink may flow into your invisible "ink layer".