UV pen with invisible ink

2024 Author: Priscilla Miln | [email protected]. Last modified: 2023-12-16 00:21

Sometimes it is necessary to write down some important secret information and at the same time be sure that no one else can read it. It is for such cases that the ultraviolet pen was created. With it, you can write invisible text. You can read it only if you use a special flashlight. A miniature light source emits ultraviolet rays, under which written in invisible ink is instantly revealed. There are no other options to read such a text.

Appearance and safety

There is no need to always carry a special flashlight with you, as it is already built into the cap of the pen. Such a device for writing looks like an ordinary felt-tip pen or a marker with a rod. The cap serves not only as a flashlight for developing various inscriptions, but also prevents the pen core from drying out, and also does not allow unusual ink to evaporate.

They contain a substance that appears only with ultraviolet radiation. However, you can not worry about their toxicity. Certified pens are absolutely harmless to he alth.

Power supply

The flashlight is powered by three small AG3 batteries. When they are used up, they can be easily changed. To do this, unscrew the top of the cap and carefully pull out the block. One set of the cheapest batteries lasts about 2 weeks. If there is a need to use a flashlight often, then it is better to purchase more expensive batteries for it. High-quality batteries will have to be changed no more than once every 2-3 months.

Turn on the flashlight with the button on the case. To prevent the batteries from being discharged during the trip, a plastic insulator is inserted between them through a special hole in the upper part of the handle.

Pros and cons

The body of the ultraviolet pen is made of durable plastic. If she falls even from a great height, nothing will happen to her.

An additional plus is that at any time with a flashlight you can check banknotes for counterfeit. Simply shine a UV light on them.

The disadvantages include the impossibility of replacing the rod. After the invisible ink runs out, the pen will have to be thrown away. Fortunately, there is a huge range of such products on the market today. Due to the large number of offers, the price has become quite affordable. For example, the Gravity Falls ultraviolet pen, which has all the properties characteristic of such products, costs about 240-300 rubles. You can find an option and cheaper - from 100rubles.

You can also try making your own invisible ink. To do this, you need to take in equal proportions all the necessary ingredients (thick rice water, juice of a sour apple, lemon or onion, fresh milk, melted wax) and mix. High-quality ink is also obtained from a few drops of copper sulfate, a spoonful of washing powder, a couple of aspirin tablets and a small amount of iodine.

Applications

How and where can I use a UV pen? There are quite a few areas of application. You can write with a pen:

• diary entries that no one but the owner should see;
• secret or love messages meant for only one specific recipient;
• safe cheat sheets that will be very convenient to use during the exam, because no teacher will guess that something is written on an ordinary snow-white sheet;
• congratulations on postcards (in order to play or surprise the birthday boy).

UV invisible ink pen can be an unusual and useful gift for both adults and children.