Since many insects can see light in the UV part of the spectrum, flowering plants have evolved patterns to attract pollinators that cannot be seen by human eyes. UV, or ultraviolet, light is an invisible form of electromagnetic radiation that has a shorter wavelength than the light humans can see.
The term “ultraviolet” means “beyond violet.” In the visible part of the spectrum, wavelength decreases — and the energy of the electromagnetic waves increases — from red through orange, yellow, green, blue and violet, so UV light has a shorter wavelength, and more energy, than violet light. The Sun produces ultraviolet light of all categories; however, the shorter, higher energy wavelengths are absorbed by oxygen in the atmosphere, and, in particular, by the ozone layer.
Ultraviolet light, specifically UV-B, is required to allow the skin to manufacture vitamin D. There are other benefits associated with ultraviolet light may that seem to be independent of vitamin D production.
Many potentially harmful microorganisms are quickly killed or inactivated by exposure to UV light. The effects of UV light on viruses, bacteria, and parasites have led to its use in disinfecting drinking water supplies. Some substances, when exposed to UV light, emit light at visible wavelengths, a phenomenon known as fluorescence. Biologists and zoologists are quite fond of ultraviolet light as it helps them take nighttime organism surveys in the field.
Many textiles used in clothing also fluoresce, and the “black lights” often used in nightclubs and at parties exploit this fact by causing clothing to glow in the dark. Many insects can see ultraviolet light and are attracted to it, so the light is often used in insect traps.
Mapping the Milky Way and other galaxies in ultraviolet light allows astronomers to build up a picture of how galaxies evolve over time. Analyzing minerals — fluorescence under ultraviolet light can distinguish between minerals that look the same under visible light. Microscopy — the shorter wavelength of ultraviolet light can resolve details too small to be seen with an ordinary light microscope. Chemical markers — substances that fluoresce in UV light, such as green fluorescent protein (GFP) may be used to study biological processes. Photochemotherapy — this is used as a treatment for psoriasis and some other skin conditions. Very fine resolution photolithography — this is used in the manufacture of semiconductor components in the electronics industry. Checking electrical insulation — “corona discharge,” where damaged insulation on electrical equipment results in ionization of the air, can be detected by the emission of ultraviolet light. Curing of adhesives and coatings — some substances polymerize and harden on exposure to ultraviolet light. UV light is classified as light because all constituents of the elctromagnetic spectrum, which UV light is one of, are light. Can UV bulbs be an energy source used for recharging solar powered lights same as the sun, or self producing energy by using UV bulbs for the source of the energy? In BT’s extracorporeal form, ultraviolet and visible light are used to treat a small amount of blood, which is then reinfused. In the 1920s, a therapy was developed in the United States that utilized ultraviolet light to irradiate the blood.
It was lost in the onslaught of the large amount of pharmaceuticals that made their way into healthcare starting in the 1950s. Since then, over 125 published medical studies demonstrated the efficacy of this remarkable treatment.
In the process, the smaller bacterial, viral or cancer cells are targeted and absorb five times as much photonic energy as their healthy counterparts.
When this “vaccine” is coupled with the photonic energy given off by the treated blood, the microbes in the bloodstream are rapidly destroyed. This enhances the body’s ability to produce antibodies, allowing the natural immune system to burst into action against even the most stubborn (antibiotic resistant) bacteria, virus or cancer cells. Then, the body works with a new supercharged immune response, greater oxygenation and a balancing of the system. There is obviously something more at work, going beyond the simple killing of invading organisms.
Watch out: While in our OPINION the ordinary use of UV flashlights and UV lamps for purposes of building or environmental inspection or security screening constitutes no unusual health risk, excessive or inappropriate exposure to high levels or protracted durations of ultraviolet light may be unsafe and possibly carcinogenic.
I discovered this as I was using a black light to look at some iridescent fishing lures the other evening. Bathing removes the powdery substance from my feet and my physician says I have no mold or other infection in my feet. A competent onsite inspection by an expert usually finds additional clues that help accurately diagnose a problem concerning building contaminants or conditions.
You may have spotted pet urine stains and pet urine-contaminated dust from carpeting, or insect fragments, or possibly some urea-containing materials. The observation that many materials contain fluorescent molecules means that interpreting light or presumed stain patterns needs to be done with some sense of location, age, material, and context.
We should explain the mechanism of fluorescence before listing things that fluoresce under black light or really UV light: According to a nice Q&A by the U. Some materials have the special property that they absorb ultra-violet light and then re-emit the light at lower frequencies that our eyes can see. The actual wavelength of black lights or UV bulbs that operates in the UV range is 280-410nm usually narrowed to 368-371 nm wavelength light. We have had a number of discussions with forensic investigators and building inspectors, have tested several UV light devices, and have experimented with the forensic use of UV light in our lab and in the field. In general inspectors find that you can use a good quality ultraviolet light source even in daylight (notice the use of small UV flashlights for document checks in airport security screening procedures). Here is a list of examples of fluorescing materials you might commonly see during an investigation inside or around a building. Bacteria: some tests for pathogens in water rely on use of a black light or UV - see SWIMMING WATER TESTS for details.
Body fluids, including blood , semen, urine, both from humans and from other animals (c often yellow). We have developed a DNA-based assay to reliably detect brown rot and white rot fungi in wood at different stages of decay.
Party decorations designed to "glow in the dark" including face paint, hair spray, jewelry, socks, nail polish, treated colored paper, specialty balloons, specialty plastic cutlery, plates &c.

Wood species: Separately at IPE DECK BOARD CUPPING we discuss the use of UV light and fluoresence to identify some (not all) wood species. Continue reading at BLOOD in ART WORKS, TESTING FOR or select a topic from the More Reading links or topic ARTICLE INDEX shown below.
Try the search box below or CONTACT US by email if you cannot find the answer you need at InspectApedia. NEMA, an ANSI organizational member and accredited standards developer, is a membership organization of manufacturers of products used in the generation, transmission, distribution, control, and end-use of electricity used in utility, medical imaging, industrial, commercial, institutional and residential applications.
Mathis provides a lighting boot for visual assessment and comparison of colors, use to compare color variations and metamerism on samples. Abstract: Exposure to solar radiation is increasingly being associated with a risk of cutaneous melanoma, and some risk has also been attributed to exposure to fluorescent lights.
DFO revealed more fingerprint detail than ninhydrin, the standard method for such surfaces.
Steven Bliss served as editorial director and co-publisher of The Journal of Light Construction for 16 years and previously as building technology editor for Progressive Builder and Solar Age magazines. Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the InspectAPedia Bookstore. The critique included in that article raises compelling questions about IgG testing assays, which prompts our interest in actually screening for the presence of high levels of particles that could carry allergens - dog dander or cat dander in the case at hand. It carries more energy than visible light and can sometimes break bonds between atoms and molecules, altering the chemistry of materials exposed to it. Wavelengths are measured in nanometers (nm), or billionths of a meter, and ultraviolet wavelengths range between 10nm and 400nm. As a result, the ultraviolet that reaches the surface consists mostly of UV-A, with a little U-VB. It converts a chemical found in the skin to a precursor of the vitamin, which then forms the vitamin itself. Airborne virus infections, such as influenza, are generally spread via droplets expelled by coughs and sneezes. The more energetic UV-B is responsible for sunburn, can cause premature aging of skin and can alter DNA in a way that can lead to skin cancers, such as melanoma.
It has the advantages of requiring little maintenance, not affecting the taste of treated water, and leaving no potentially harmful chemicals behind. Common fluorescent lamps, for example, are powered by UV light produced by ionizing low-pressure mercury vapor. Sensitive documents, such as currency, driver's licenses, credit cards, and passports, have invisible symbols on them that light up only in the presence of UV light. Certain birds, reptiles, and invertebrates, such as insects, fluoresce under UV, and quickly flashing a light over a small area can allow observers to count the approximate number of organisms of a given type.
These lights primarily produce light in the UV portion of the spectrum, but they also produce a slight violet glow. These may be used by entomologists to study the insect population in a specific habitat or to trap and kill nuisance insects in restaurants food stores. Visible light is simply the segment on the electromagnetic spectrum that represents light with a wavelength perceptible to the human eye. Visible light is simply the segment on the spectrum that classifies the light that the human eye can perceive. After more than two decades of debate, experimentation by patients, and scattered clinical testing of non-drug therapies of HIV, we now know much better which ones actually work. It proved to be very effective at treating a variety of ailments while showing very little toxicity.
The good thing is that Eastern Europe could not afford the drugs, so they carried on the research into this very useful medical treatment. These studies have mostly been published in Europe, and the therapy is very slowly beginning to re-emerge in the US.
This blood circulates through a medical ultraviolet device where it is exposed to ultraviolet light of two frequencies. The healthy cells remain intact while the diseased cells are killed and become “antigenic.” An “autogenous (self-generated) vaccine” is thus produced. With that, more research is being done to clearly delineate what else is going on in this process. Catalog of materials that fluoresce under black light (UV light) & sources of UV lights, supplies. We describe the use of a black light, UV light to screen buildings for pet urine or urine from humans or other animals even where no stains are visible in or around buildings. Small black lights are available from pet supply stores, art supply stores, and forensic and police equipment suppliers and are generally inexpensive. But because a large number of materials will fluoresce under a black light, we need to give some thought to how to interpret what our UV light is actually revealing when we shine it on a building material or surface. That said, there are a number of materials that will fluoresce under an ultraviolet UV or "black light", even clean white sheets appear to do so.
But for weak or dilute sources of fluorescent materials, such as very dilute fluorescein septic dye that might appear in a waterway up to a week after a septic loading and dye test, screening the target using ultraviolet lighting under low light or dark conditions is still more effective.
In parentheses our c=XX note indicates common colors you will see from each material when it is exposed to ultra violet light in a dark area.
For medical and forensic work we use luminol, an ultra-sensitive spray that fluoresces in the presence of blood. DNA, isolated by a series of CTAB (cetyltrimethylammonium bromide) and organic extractions, was amplified by the PCR using published universal primers and basidiomycete-specific primers derived from ribosomal DNA sequences. The red or green fluorescein dye used in septic testing is usually visible to the naked eye but at low concentrations it may still be observed using a UV light.
The urine-soaked cotton held in tweezers in our photo was not able to be identified by a test using this particular light source. The recently published standard sets forth the physical and electrical characteristics of the principal types of fluorescent lamps intended for application on conventional line frequency circuits and electronic high-frequency circuits. The light booth provides four or five standardized light sources (daylight -D65, fluorescent -TL84, incandescent - A home light color temp. The risk of cutaneous melanoma associated with exposure to some sources of artificial ultraviolet radiation was examined in a case-control study in a Scottish population with fairly low exposure to natural ultraviolet radiation.
Investigators reviewed the previous training and frequency of use of the WL by emergency medicine and pediatric emergency medicine physicians at 2 medical centers. The salient features of the procedures are simplicity, manual typing, nonradioactive chemiluminescent assays or silver staining for detection, and low cost.

It can extract features from source images, and provide more information than one image can.
Sheryl Miller, MT (ASCP), PhD, is an Immunologist and Associate Professor of Basic and Medical Sciences at Bastyr University in Bothell, Washington. UV light can also cause some substances to emit visible light, a phenomenon known as fluorescence.
This vitamin is essential to human health, and a lack of it has been implicated in immune system disorders, cardiovascular disease, high blood pressure and various cancers. Virus particles in these droplets do not survive long if exposed to sunlight, and as a result, these diseases may not spread so easily in sunny conditions. The main disadvantage is that, unlike some chemical methods — such as chlorination — it will not protect against contamination after treatment. This light is absorbed by a special fluorescent coating, which in turn produces visible light. This is very helpful because many of these animals are mainly nocturnal and rarely if ever seen during the day. Special posters or other works of art can also be created with the express purpose of fluorescing a certain way under a black light. They also produce a higher proportion of their ultraviolet light at the extreme end of the spectrum.
A dozen books and some 400 articles in the German, Russian, and English-language medical literature describe Biophotonic Therapy.
The only problem: you cannot patent ultraviolet light, so no one could make large amounts of money from it. Once treated with the light, the blood is returned to the patient in the simple closed loop system. However, this therapy is available right now; and it is said that patients feel results within the first two to three treatments. Using a black light to find sources of indoor building smells and odors from dogs, cats, rodents, bats, unusual pets, and even people can be tricky; here are our suggestions. We surveyed 14 species of wood-decaying basidiomycetes (brown-rot and white-rot fungi), as well as 25 species of wood-inhabiting ascomycetes (pathogens, endophytes, and saprophytes). The risk was not significantly or consistently raised for exposure to fluorescent lights at home or at work.
The Wood's lamp (WL) emits ultraviolet light (UVL) and has been identified as useful in rape evaluations because it is purported to cause semen to fluoresce. Multi-resolution analysis plays an important role in image processing, it provides a technique to decompose an image and extract information from coarse to fine scales. This form of light — which is present in sunlight — can be beneficial to health, as it stimulates the production of vitamin D and can kill harmful microorganisms, but excessive exposure can cause sunburn and increase the risk of skin cancer.
There is evidence that people with outdoor occupations are less susceptible to the disease. UV light stimulates the production of the pigment melanin, and because of this, people may intentionally expose themselves to strong sunlight to obtain a tanned skin. Areas where new stars are forming therefore glow more brightly in UV, enabling astronomers to identify and map these areas. DNA was isolated from pure cultures of these fungi and also from spruce wood blocks colonized by individual isolates of wood decay basidiomycetes or wood-inhabiting ascomycetes. This study was intended to determine if semen can be distinguished from other products by WL analysis. In some practical forensic examinations (such as the cartridge image check), we cannot obtain all information from just one image; on the contrary, we need information from images with difference light sources (or light ways).
Lack of sunlight is the main cause of vitamin D deficiency, and sunscreen prevents its formation. Children who spend a lot of time on outdoor activities also appear to be at less risk of developing skin cancers later in life. The effects associated with this form of light may be aggravated by the popularity of tanning studios and sunbeds, which use artificially produced ultraviolet light to cause tanning. The primer pair ITS1-F (specific for higher fungi) and ITS4 (universal primer) amplified the internal transcribed spacer region from both ascomycetes and basidiomycetes from both pure culture and wood, as expected. This article discusses the photographic techniques involved in reflective and fluorescent UVL. In this paper, we apply an image fusion method based on multi-resolution analysis to forensic science. Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The Home Reference Book & illustrations from The Illustrated Home. Other possible beneficial effects include reduced incidence of cardiovascular disease, improvement of some skin conditions, and mood enhancement. The primer pair ITS1-F (specific for higher fungi) and ITS4-B (specific for basidiomycetes) was shown to reliably detect the presence of wood decay basidiomycetes in both pure culture and wood; ascomycetes were not detected by this primer pair. The risks associated with exposure to ultraviolet lamps and sunbeds remained significant after adjustment for other risk factors for melanoma. Documentation of skin wounds via still photography and dynamic video photographic techniques, which utilize various methods of UV illumination, are covered. Synthetic and real images (such as images from closed-up photography and flash photography) are used to show the capability of the multi-resolution image fusion technique. We detected the presence of decay fungi in wood by PCR before measurable weight loss had occurred to the wood. Techniques important for courtroom presentation of evidence gathered from lacerations, contusions, abrasions, and bite marks are presented through case studies and controlled experiments.
Basidiomycetes were identified to the species level by restriction fragment length polymorphisms of the internal transcribed spacer region.
The text is intended as a reference guide to help building owners operate and maintain their home effectively. Special Offer: For a 10% discount on any number of copies of the Home Reference Book purchased as a single order. Special Offer: For a 5% discount on any number of copies of the Home Reference eBook purchased as a single order.

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