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TattoosTattoos are permanent markings made by pigments injected beneath the outer layer of skin. They remain indelible by harnessing immune cells called macrophages, which perceive ink as a foreign body and try to digest it. Ink particles can’t be broken down, so macrophages hold on to them, helping maintain the tattoo pattern. Historically, tattoos were tapped into the skin with sharpened objects. In fact, the word “tattoo” comes from “tatatau,” the Polynesian word for “to strike.” Throughout the ages, tattoos have functioned as markers of status, brands, ornamentation, spiritual protection, and therapeutic tools, depending on the cultural context. Tattoos are more visible in the US than in the past, with around 32% of adults sporting at least one. Despite their popularity, studies show that tattoo wearers are associated with stereotypes of promiscuity, incompetence, and dishonesty, possibly due to lingering associations of tattoos with crime.Explore Tattoos

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The body can remove tattoos after they are broken down by laserTattoos place blobs of ink below the surface layers of the skin in packets too large for white blood cells to clear out. By breaking the ink into smaller pieces, they can be processed by the immune system, which is responsible for removing foreign matter. JustINKD How 'the Iceman' got his tattoos remains a mysteryÖtzi the Iceman, discovered in 1991, is one of the oldest human mummies ever found—and his 61 tattoos remain a mystery. This explainer looks at how researchers believe the tattoos were made, what their placement suggests about ancient medicine and culture, and why we’re still piecing together their true purpose today. 1440 Tattoos, explainedTattoos last because immune cells trap ink beneath the skin—but there's more to the story. This overview looks at how ancient cultures used tattoos for status, spirituality and punishment; how technology like the electric tattoo machine transformed the art form, and where innovations like smart tattoos could take it next. 1440 Harvard and MIT researchers are developing life-saving tattoosTattoos aren’t just a fashion statement. Scientists are trying to find life-saving applications for them. Harvard and MIT researchers are developing tattoo inks that react to body chemicals, alerting diabetics to blood sugar fluctuations or athletes to dehydration. Someday, patients may observe their body chemistry with tattoos that change colors. Harvard University Yakuza gangsters' tattoos often portrayed moments from their livesAlthough tattoos have been worn in Japan for centuries, no single group is more famous for their elaborate, full-body tattoos—featuring traditional Japanese art—than Yakuza gangsters. The criminal organization does not use tattoos to mark their association, though. Instead, the scenes are intensely personal. Feature History Sailor tattoos represent naval milestonesSailors often come home with mermaids or turtles adorning their bodies. But what does it mean to have permanent images of propellers on your bum, British galleons with soaring tiers of sails on your chest, or a bicep portrait of the Roman god Neptune? Those tattoos represent meaningful naval milestones. Chatham Historic Dockyard Trust Women in WWII used tattoos to avoid captureDuring World War II, Japanese soldiers kidnapped women from Southeast Asian countries and forced them into sexual slavery. But they hesitated to capture married women, a fact that women from the island of Timor exploited, painstakingly poking tattoos onto their bodies that marked them as married women. VICE Asia Tattoos suppressed during colonization are experiencing a revivalA few decades ago, the distinct facial tattoos worn by Maori people were on the brink of disappearing. Then, Maori artists brought the cultural practice back into the spotlight. This TVNZ story follows one reporter’s mother as, at 59 years old, she receives tā moko from a Maori artist. 1News There are stigmas attached to tattoosAlthough tattoos are fairly common in the US, some taboos remain. A 2017 study in the Journal of Social Psychology found discrimination against tattoos is alive and well, and that even individuals with tattoos associate them with negative stereotypes. The Journal of Social Psychology Tattoos were once used to identify statusAround 450 BCE, Scythians inhabiting what is now southern Siberia were recorded as wearing tattoos of swirling mythical beasts to signify nobility. At the same time, tattoos have identified lower-status and enslaved people. TED-Ed The world’s oldest tattoos belong to 'Iceman' ÖtziÖtzi is the corpse of "the Iceman" found in the Alps along the Italian and Austrian border in 1991. His mummified body was covered with lines and crosses along the “hard-working” areas of his body, signifying their potential application for therapeutic pain management. Smithsonian Institution Tattoos remain visible thanks to immune cells called macrophagesMacrophages are a robust part of the human immune system. These large cells engulf invading particles, like viruses and bacteria, and use enzymes to break them apart. They perceive ink as a foreign body but can't digest them. Macrophages hold on to the ink, helping maintain the tattoo pattern. Bio-Rad Tattoos are made by injecting pigments into the skinTattoo ink is injected under the skin, which can leave the body open to infections and allergic reactions. While many tattoo artists are licensed professionals who follow sanitary guidelines, that’s not always the case. Mayo Clinic The immune system fights tattoosOur skin is a fascinating organ that wants nothing more than to protect our bodies from the outside world. Tattoos penetrate that protective wall to inject ink directly into the sensitive, immunologically rich layer of skin known as the dermis. Kurzgesagt – In a Nutshell View the winners of the 2025 Global Physics Photowalk contestParticipants were asked to submit entries showcasing particle physics labs from around the world, including particle accelerators, neutrino detectors, and superconducting experiments. The winning photograph was taken at the CryOgenic Laboratory for Detectors, where scientists hunt for dark matter after cooling materials to a few thousandths of a degree above absolute zero. Quanta Magazine Removal of different color tattoo inks may require multiple lasersLight needs to be absorbed by ink particles to break them down into small enough pieces for the immune system to eliminate. Color ink reflects, rather than absorbs, lasers of the same color, while black ink absorbs all colored lasers. Kurzgesagt – In a Nutshell Laser procedures have made tattoo removal much more commonAn increasing number of Americans, including high-profile celebrities, get tattoos removed because laser removal has become more advanced and cost-effective. The tattoo industry is adjusting to this mainstream trend. GQ Tattoo removal breaks apart ink particlesTattoos place ink below the skin's surface layers in packets too large for white blood cells to clear out. By breaking the ink into smaller pieces, the immune system, which is responsible for removing foreign matter, can process them. Removery 'Skin stitching' is an ancient tattoo method that's made a comebackIn the slow method, artists use needles to puncture the skin. Then, pigmented thread is drawn through the punctures to create the tattoo, resembling embroidery in the flesh. The method is experiencing a cultural revival within Canada’s First Nations communities. CBC 'Magic ink' is redefining the tattooOne University of Colorado professor has developed an ink that can be "turned on" with exposure to UV light, and "turned off" with sunlight. While the ink could help those who want to hide their body art from family members or coworkers, there are potential uses for medical procedures. Denver 7 Technological breakthroughs are spurring innovations in the industryWhat if you could see your tattoos before they’re embedded in your skin? Or take a virtual visit into a local studio to work out your nerves over a first tattoo? The industry is anticipating some big technological changes, from 3D designs to sci-fi upgrades to more precise tattoo guns. Magnum Tattoo Supplies Tattoo inks are largely unregulated by the FDAWith hundreds of ink manufacturers, all unregulated by the FDA, it’s hard to determine the exact ingredients in tattoo inks. Some pigments may contain carcinogenic chemicals, such as heavy metals and aromatic hydrocarbons, or even bacterial contaminants. Red ink often causes allergic reactions and may even contain lead or mercury. The List Around 32% of American adults have at least one tattooTattoos have waxed and waned in popularity over the centuries, depending upon the social standing of their wearers. Throughout US history, they were often considered taboo. However, growing acceptance of tattoos means they’re more visible in the public eye. Pew Research Center Samuel O’Reilly patented the tattoo gun in 1891Before the tattoo gun's invention, recipients sweated while artists slowly tapped or sliced designs into their flesh. The tattoo gun changed the field, helping artists ink clients’ skin at incredible speeds. Inventor Samuel O’Reilly applied the basic idea of an electric pen invented by Thomas Edison to his tattoo gun. SPARK Museum of Electrical Invention 'Tattoo' comes from a Polynesian word that means 'to strike'“Tatatau” roughly translates to “strike,” a reference to the ancient process, which involved tapping ink into the skin with sharpened objects, like the bronze implements used circa 1450 BCE in Egypt, below. Smithsonian Magazine

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