Ultraviolet(UV) light iselectromagnetic radiationwith awavelengthfrom 400nm to 10nm, shorter than that ofvisible lightbut longer thanX-rays. Though usually invisible, under some conditions children and young adults can see ultraviolet down to wavelengths of about 310nm,[1][2]and people withaphakia(missing lens) can also see some UV wavelengths. Near-UV is visible to a number of insects andbirds.UV radiation is present insunlight, and is produced byelectric arcsand specialized lights such asmercury-vapor lamps,tanning lamps, andblack lights. Although lacking the energy toionize atoms, long-wavelength ultraviolet radiation can causechemical reactions, and causes many substances to glow orfluoresce. Consequently, biological effects of UV are greater than simple heating effects, and many practical applications of UV radiation derive from its interactions with organic molecules.Suntanandsunburnare familiar effects of over-exposure, along with higher risk ofskin cancer. Living things on dry land would be severely damaged by ultraviolet radiation from the sun if most of it were not filtered out by the Earth's atmosphere, particularly theozone layer.[3]More-energetic, shorter-wavelength "extreme" UV below 121nm ionizes air so strongly that it is absorbed before it reaches the ground.[4]Ultraviolet is also responsible for the formation of bone-strengtheningvitamin Din most land vertebrates, including humans. The UV spectrum thus has effects both beneficial and harmful to human health.How does ultra violet rays worksBest Answer:Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than soft X-rays. It can be subdivided into near UV (380200 nm wavelength), far or vacuum UV (20010 nm; abbrev. FUV or VUV), and extreme UV (131 nm; abbrev. EUV or XUV).

When considering the effect of UV radiation on human health and the environment, the range of UV wavelengths is often subdivided into UVA (380315 nm), also called Long Wave or "blacklight"; UVB (315280 nm), also called Medium Wave; and UVC (< 280 nm), also called Short Wave or "germicidal". See 1 E-7 m for a list of objects of comparable sizes.

In photolithography, in laser technology, etc., the term deep ultraviolet or DUV refers to wavelengths below 300nm.

The name means "beyond violet" (from Latin ultra, "beyond"), violet being the color of the shortest wavelengths of visible light. Some of the UV wavelengths are colloquially called black light, as it is invisible to the human eye. Some animals, including birds, reptiles, and insects such as bees, can see into the near ultraviolet. Many fruits, flowers, and seeds stand out more strongly from the background in ultraviolet wavelengths as compared to human color vision. Scorpions glow or take on a yellow to green color under UV illumination. Many birds have patterns in their plumage that are invisible at usual wavelengths but observable in ultraviolet, and the urine of some animals is much easier to spot with ultraviolet.

The Sun emits ultraviolet radiation in the UVA, UVB, and UVC bands, but because of absorption in the atmosphere's ozone layer, 99% of the ultraviolet radiation that reaches the Earth's surface is UVA. (Some of the UVC light is responsible for the generation of the ozone.)

Ordinary glass is partially transparent to UVA but is opaque to shorter wavelengths while Silica or quartz glass, depending on quality, can be transparent even to vacuum UV wavelengths. Ordinary window glass passes about 90% of the light above 350nm, but blocks over 90% of the light below 300nm. (refs:UltraViolet Light Sensitive UV Powder or UV Paint is a product that glows only when exposed to UV light (black light). With a body color of white or light-green, these powders can glow in colors like green, blue, yellow, purple, red and violet.These powders only glow when exposed to UV black light. Remove the UV light source and they stop glowing. Glow effects are visible in both bright and dark environments. We carry both the UV Powder and UV Paint here.Nontoxic, harmless, free from any radioactive additives, good chemical stability and insoluble in water are some of this powder's characteristics. It can be added to various mediums like paint, printing ink, plastic, rubber, resin, glass, etc.Suitable areas of application would be as signs or decoration in places like hotels, restaurants, discos, and other public areas like outdoor advertisements, neon lamps, and indoor illumination. This product is also popular with artists who create paintings with special UV effects.This is the raw UV Light Reactive Powder.Particle size is between 4~6um.It can be mixed with clear inks to produce UV Paint.The UV Paints are mixed to a ratio of between 10% to 20% UV Powder to clear ink.

Product CodeNormal ColorUV ColorWave Length

UVB450nm

UVP420nm

UVG505nm

UVW510nm

UVY545nm

UVO590nm

UVR615nm

UVBG500nm

UVYG595nm

Infrared(IR) is invisible radiant energy,electromagnetic radiationwith longerwavelengthsthan those ofvisible light, extending from the nominalrededge of thevisible spectrumat 700nanometers(frequency430THz) to 1mm (300GHz)[1](although people can see infrared up to at least 1050nm in experiments[2][3][4][5]). Most of thethermal radiationemitted by objects near room temperature is infrared.Infrared radiation was discovered in 1800 by astronomer SirWilliam Herschel, who discovered a type of invisible radiation in the spectrum beyond red light, by means of its effect upon a thermometer.[6]Slightly more than half of the total energy from the Sun was eventually found to arrive on Earth in the form of infrared. The balance between absorbed and emitted infrared radiation has a critical effect on Earth'sclimate.Infrared energy is emitted or absorbed bymoleculeswhen they change theirrotational-vibrationalmovements. Infrared energy elicitsvibrationalmodes in amoleculethrough a change in thedipole moment, making it a useful frequency range for study of these energy states for molecules of the proper symmetry.Infrared spectroscopyexamines absorption and transmission ofphotonsin the infrared energy range.[7]Infrared radiation is used in industrial, scientific, and medical applications. Night-vision devices using active near-infrared illumination allow people or animals to be observed without the observer being detected.Infrared astronomyuses sensor-equippedtelescopesto penetrate dusty regions of space, such asmolecular clouds; detect objects such asplanets, and to view highlyred-shiftedobjects from the early days of theuniverse.[8]Infrared thermal-imaging cameras are used to detect heat loss in insulated systems, to observe changing blood flow in the skin, and to detect overheating of electrical apparatus.Thermal-infrared imaging is used extensively for military and civilian purposes. Military applications includetarget acquisition, surveillance,night vision, homing and tracking. Humans at normal body temperature radiate chiefly at wavelengths around 10m (micrometers). Non-military uses includethermal efficiencyanalysis, environmental monitoring, industrial facility inspections, remote temperature sensing, short-rangedwireless communic