The Ultraviolet (UV) mark is a pen whose signs are fluorescent but transparent: signs can only be seen under ultraviolet light. They are usually used in security situations to identify items or to protect from copying banknotes. UV pens can now be purchased at several stationery stores to safely mark high value items in case of theft.
Video UV marker
Materials used to create UV markers
The body of the UV marker is made by a plastic similar to a normal marker. The ink used in UV markers has been made from things in the past such as lemon juice, vinegar, diluted blood or even urine. Modern UV-invisible inks primarily made by neon are derived from things in nature that shine when exposed to ultraviolet light. The main components include laundry detergent, body fluids, tonic water and vitamin B-12 dissolved in vinegar. There are different types of UV-invisible ink: opaque, semi-opaque and translucent. All three contain acrylic monomers containing diluents and photoinitiators to participate in the curing reaction and to respond to UV radiation. Photoinitiators are a very important element for making ink because it is a substance that absorbs UV missions from UV rays, allowing the marker to work.
Maps UV marker
How the UV marker works
UV LEDs used to read messages written by UV markers emit close ultraviolet light. The energy of near ultraviolet radiation is also called black light that falls outside the visible spectrum with a wavelength of 380 nm. Such wavelengths are very narrow and will fall in a much broader band than ordinary fluorescent neon lights. Therefore, UV LEDs are completely safe. This will not cause damage to your eyes or the risk of skin cancer. When black light falls on the UV-visible ink, it makes the ink glow, where it emits visible light and makes the message readable to the human eye.
Fluorescence is caused by energy conversion; when an invisible ultraviolet falls on a fluorescent surface, it is absorbed and re-emitted as visible light radiation. The absorption of energy by electrons in UV-visible inks allows this to happen. When the amount of extra energy is absorbed, the electrons jump into higher energy orbital patterns around the nucleus. Finally, energy is released as visible light when it falls back into its normal orbital shell. The difference between the original electron orbital and the new orbital pattern will determine the color of the neon.
In some cases, one can also use a photocopier to develop a UV ink message-seen as a photocopier's head containing a UV component.
Apps & amp; use of UV marker
Security
Commercially available UV markers are used to mark things for security purposes, such as to check for counterfeit money and mark property in case of theft for the purpose of identifying ownership. Sometimes it is also used to identify whether similar documents are authentic copies.
Authentic destination
UV markers are also widely used on credit cards or lottery tickets for authentic purposes. For example, in the state of Illinois, lottery tickets are stamped with invisible ink to show authenticity while credit cards are marked with a specific logo or card type. In addition, different countries use UV markers to mark the driver's license and identity cards issued to ensure they are genuine. Other cases include retailers who mark their goods to avoid customers exchanging or returning items they do not initially buy from their stores.
Protect secret messages
Many people and organizations use UV markers to protect and hide sensitive messages from the public. Especially during times of war, UV-invisible is widely used in the military to hide secret messages and important addresses to avoid their enemies to have detailed information about their subsequent actions as this will put them at a profit by giving them time to prepare and give them the possibility of undermining their plans.
During World War II, the battle between laboratories to develop the best invisible UV ink revealed between Allied & amp; power of the Axis. They are trying desperately to develop a new, better-than-UV-invisible ink that can only be expressed by very few types of UV rays with very special wavelengths. This is not just because they can hide more messages from their enemies, but this will also allow them to find methods to read hidden messages from their enemies.
Hygiene assessment of toilets
People use UV markers to check if the cleaners have cleaned the toilet properly and determine how well the toilet is cleaned. Markers used in this case are lotions, which are non-toxic and water soluble, making it easy to clean with soap and water solution. The UV marker is applied to the underside of the toilet seat. Not easily visible under ordinary room lighting. The toilet will then be visually inspected with hand-held UV rays to determine how well the toilet is cleaned up a few days later. The inspector will then create a visual score; 1 represents fluorescent light, 2 for moderate, 3 for weight and 0 does not represent fluorescence. This rating system is based on visual inspection and the average clearance score will be calculated. If no cleaning is done, the markers will show severe fluorescence that will last at least 7 days after being applied. The fewer markers found, the better the toilet is cleaned.
UV marker restrictions
Messages written by UV markers can be found by the wrong person when there is a change in the paper's reflectivity or pen stroke on the paper. The smell of ink also reduces the security of secret messages because hidden messages can be easily found with the help of trained animals.
UV markers should not be used on surfaces that may already contain similar elements found in UV marker inks, such as high-capacity photocopier paper. This is because the message will not be displayed clearly because the surface will change color or react with ink when under UV light. Therefore, we should always test on the surface in the area that is not conspicuous to determine the outcome. Similarly, when writing with a UV marker on a very smooth and glossy surface, ink will show only an obscure line of what is written and can be erased easily. This is because ink is prevented from being so absorbed onto the surface as it is above a piece of plain paper. In addition, messages can be easily seen when exposed under the glance of the glance.
Unlike other invisible inks, which require heat or put chemical fluids to reveal messages, invisible UV inks can be filtered and read quickly with an ultraviolet light source without damaging or altering the surface of the paper. This means that people will not be able to notify or notice if the secret message has been intercepted by a third party.
See also
- List of pens, brands and companies
References
Source of the article : Wikipedia
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