Because it requires breaking the skin barrier, tattooing carries health risks including infection and allergic reactions. Tattooing can be uncomfortable to excruciating depending on the area and can result in the person fainting. Modern tattooists reduce risks by following universal precautions working with single-use items and sterilizing their equipment after each use. Many jurisdictions require that tattooists have blood-borne pathogen training such as that provided through the Red Cross and OSHA. As of 2009 (in the United States) there have been no reported cases of HIV contracted from tattoos.
The FDA regularly issues warnings to consumers about avoiding any temporary tattoos labeled as black henna or pre-mixed henna as these may contain potentially harmful ingredients including silver nitrate, carmine, pyrogallol, disperse orange dye and chromium. Black henna gets its color from paraphenylenediamine (PPD), a textile dye approved by the FDA for human use only in hair coloring. In Canada, the use of PPD on the skin, including hair dye, is banned. Research has linked these and other ingredients to a range of health problems including allergic reactions, chronic inflammatory reactions, and late-onset allergic reactions to related clothing and hairdressing dyes. They can cause these reactions long after application. Neither black henna nor pre-mixed henna are approved for cosmetic use by the FDA.
Do not wrap your tattoo again unless the artist says so. It’s highly important to keep the tattoo clean after the protection has been removed. Keep in mind that your new tattoo is similar to an open injury. Plenty of tattoo artists recommend hand-washing the tattoo lightly but thoroughly with your clean fingers, using an unscented and anti-bacterial soap. Let it air dry or pat it gently with a dry and clean paper towel. Everything you use or touch should be clean. It’s also common for a new tattoo to be inflamed, red, or sensitive.
It is commonly held that the modern popularity of tattooing stems from Captain James Cook's three voyages to the South Pacific in the late 18th century. Certainly, Cook's voyages and the dissemination of the texts and images from them brought more awareness about tattooing (and, as noted above, imported the word "tattow" into Western languages). On Cook's first voyage in 1768, his science officer and expedition botanist, Sir Joseph Banks, as well as artist Sydney Parkinson and many others of the crew, returned to England with tattoos, although many of these men would have had pre-existing tattoos. Banks was a highly regarded member of the English aristocracy that had acquired his position with Cook by co-financing the expedition with ten thousand pounds, a very large sum at the time. In turn, Cook brought back with him a tattooed Raiatean man, Omai, whom he presented to King George and the English Court. On subsequent voyages other crew members, from officers, such as American John Ledyard, to ordinary seamen, were tattooed.
Mainstream art galleries hold exhibitions of both conventional and custom tattoo designs, such as Beyond Skin, at the Museum of Croydon. Copyrighted tattoo designs that are mass-produced and sent to tattoo artists are known as "flash", a notable instance of industrial design. Flash sheets are prominently displayed in many tattoo parlors for the purpose of providing both inspiration and ready-made tattoo images to customers.