What is black light?

black light is a bulb with an inner coating that limits wavelengths that can pass through the glass. It releases very small light visible to the human eye and gives it its opposite name. Instead, black light emits mainly ultraviolet (UV) or black light radiation that cannot be seen. However, some colors and pigments absorb invisible light and then discharge it, causing a glowing effect. These lights are often used for entertainment purposes, but those that produce medium and short -wave rays use forensic and other types of scientists and healthcare workers.

How does it work

black light wavelengths begin at one extreme end of visible light in the range of visible light (HEV) with high energy. Hev waves are detected by the human eye like deep blues and violets. These wavelengths eventually become so short and scattered that they are no longer visible. These lights are shining with a muffled with a dark blue or purple glow, which is sometimes referred to as blackBlue light.

Traditionally, black lights were made of special glass called Wood's Glass, which allowed to go through UV and infrared (IR) headlight. However, this type of glass is not very strong, so special coatings are now commonly used on bulbs to prevent visible light. There are both bulbs and fluorescent black lights, although bulbs usually burn much warmer and after a shorter time than standard bulbs. Mercury steam lamps are commonly used for theater displays because they more efficiently produce the necessary type of UV light.

Fluorescent black lights are some of the most common types because they are almost identical to common fluorescent bulbs. The pipes contain a small amount of mercury, which mostly release UV light when it turns from the liquid. Standard lights have a phosphor coating, which is a compound that responds to UV emitting visitorthe light of light. In black lights, a different type of phosphorus that increases UV is used. A purple blue coating is added to block the light that is visible.

phosphors are any compounds that shine or emit light in certain conditions. Not only are they used to stretch fluorescent bulbs, they create pictures on the TV screens of the Cathode Ray (CRT) and create glows of hot toys. Some types react with black light and can be used in color and posters, causing the glow of images. Some of the compounds that make up many types of detergents also absorb UV radiation and secrete it as visible light, explain why white shirts and socks so great under black light.

uses

black lights can be used for different purposes depending on their wavelengths in the UV range. Lights long wool lights are often used for entertainment purposes not to evaporate diseases; Medium wave may help investigators find body fluids or counterfeit objects; TimesThe wool can kill bacteria. The wavelengths are measured in nanometers (one billion meters). The UV spectrum generally decreases between 100 and 380 nanometers.

uv-a

UV black light with long wave emits wavelengths between 380 and 315 nanometers. Individuals often use these types of lamps for entertainment purposes, for example at concerts and clubs. The lights create the materials in the dark and help create the atmosphere.

Bug Zapper Lights also emit UV-A light. Insects are able to see light in the UV range so that they are strongly attracted to the equipment. They usually do not include a purple blue coating because it is not important to block visible light.

A medical tool called a wooden lamp also uses light to this range to detect skin diseases and other conditions. Some organic compounds, fungi and bacteria shine in exposure to this light, help medical experts see the extent of some types of infections. The lamp was also used to diagnose other skin conditionsthe conditions.

uv-b

The light that emits the UV-B rays of the middle wave between 314 and 280 nanometers is called black light with medium wool. These types can cause radiation of certain body fluids (also called luminescence). Investigators of the crime scene and forensic laboratories often use such lights to detect blood, saliva, sperm and other fluids. Some people use them to find places where pets urinate to clean the area.

The black lights of the middle wave are also used to identify anti-centered markers in the currency and detect art counterfeits, including security. For example, they also benefit from snakes and lizards for pets because they provide vitamin D that need reptiles. Treatment with UV-B can also help people with certain skin conditions such as psoriasis and vitiligo.

uv-c

If the wavelength lies between 279 A200 nanometers, the short wave of UV-C black light is called. Such lights emit radiationThe destructive is sufficiently destructive to kill bacteria and other harmful organisms. The radiation can be used to clean the water of living contaminants or sterilize medical equipment.

Safety measures

For the possibility of damage to the eyes with invisible radiation, individuals should not look at the black lights. Experts with extended and repeated exposure, especially UV-B and UV-C lights, should wear protective glasses with yellow color lenses. The yellow shade blocks the waves of blue light in the spectrum of HEV or almost UV, which are the waves that healthcare workers have associated with macular degeneration. UV light can also cause skin and wavelength B and C to directly damage DNA, which potentially leads to skin cancer. However, experts do not believe that occasional exposure to black lights is harmful.