Process of tattooing
The process of tattooing involves the insertion of pigment into the skin's dermis. Traditionally, tattooing often involved rubbing pigment into cuts. Modern tattooing almost always requires the use of a tattoo machine and often procedures and accessories to reduce the risk to human health.
Physiological process of tattooing
Tattooing involves the placement of pigment into the skin's dermis, the layer of dermal tissue underlying the epidermis. After initial injection, pigment is dispersed throughout a homogenized damaged layer down through the epidermis and upper dermis, in both of which the presence of foreign material activates the immune system's phagocytes to engulf the pigment particles. As healing proceeds, the damaged epidermis flakes away (eliminating surface pigment) while deeper in the skin granulation tissue forms, which is later converted to connective tissue by collagen growth. This mends the upper dermis, where pigment remains trapped within fibroblasts, ultimately concentrating in a layer just below the dermis/epidermis boundary. Its presence there is stable, but in the long term (decades) the pigment tends to migrate deeper into the dermis, accounting for the degraded detail of old tattoos.
Some tribal cultures traditionally created tattoos by cutting designs into the skin and rubbing the resulting wound with ink, ashes or other agents; some cultures continue this practice, which may be an adjunct to scarification. Some cultures create tattooed marks by hand-tapping the ink into the skin using sharpened sticks or animal bones (made like needles) with clay formed disks or, in modern times, needles. Traditional Japanese tattoos (irezumi) are still "hand-poked," that is, the ink is inserted beneath the skin using non-electrical, hand-made and hand held tools with needles of sharpened bamboo or steel. This method is known as tebori.
Traditional Hawaiian hand-tapped tattoos are experiencing a renaissance, after the practice was nearly extinguished in the years following Western contact. The process involves lengthy protocols and prayers and is considered a sacred rite more than an application of artwork. The tattooist chooses the design, rather than the wearer, based on genealogical information. Each design is symbolic of the wearer's personal responsibility and role in the community. Tools are hand-carved from bone or tusk without the use of metal.
The most common method of tattooing in modern times is the electric tattoo machine, which inserts ink into the skin via a single needle or a group of needles that are soldered onto a bar, which is attached to an oscillating unit. The unit rapidly and repeatedly drives the needles in and out of the skin, usually 80 to 150 times a second. This modern procedure is ordinarily sanitary. The needles are single-use needles that come packaged individually. The tattoo artist must wash his or her hands and must also wash the area that will be tattooed. Gloves must be worn at all times and the wound must be wiped frequently with a wet disposable towel of some kind. The equipment must be sterilized in a certified autoclave before and after every use.
Prices for this service vary widely globally and locally, depending on the complexity of the tattoo, the skill and expertise of the artist, the attitude of the customer, the costs of running a business, the economics of supply and demand, etc. The time it takes to get a tattoo is in proportion with its size and complexity. A small one of simple design might take 15 minutes, whereas an elaborate sleeve tattoo or back piece requires multiple sessions that may consist of several hours at a time ranging over months or even years.
In 1891 the first electric tattoo needle was invented in New York City by modifying Thomas Edison's electric engraving pen. This made the process cheaper and faster; it was taken up by the poor and abandoned by the rich. O'Reilly's machine was based on the rotary technology of the electric engraving device invented by Thomas Edison. Modern tattoo machines use electromagnetic coils. The first coil machine was patented by Thomas Riley in London in 1891, using a single coil. The first twin-coil machine, the predecessor of the modern configuration, was invented by another Englishman, Alfred Charles South of London, in 1899.
Dyes and pigments
Early tattoo inks were obtained directly from nature and were extremely limited in pigment variety. In ancient Hawaii, for example, kukui nut ash was blended with coconut oil to produce an ebony ink. Today, an almost unlimited number of colors and shades of tattoo ink are mass-produced and sold to parlors worldwide. Tattoo artists commonly mix these inks to create their own unique pigments.
A wide range of dyes and pigments can be used in tattoos, from inorganic materials like titanium dioxide and iron oxides to carbon black, azo dyes, and acridine, quinoline, phthalocyanine and naphthol derivatives, dyes made from ash, and other mixtures. Iron oxide pigments are used in greater extent in cosmetic tattooing.
Modern tattooing inks are carbon-based pigments that have uses outside of commercial tattoo applications.
Concern has been expressed over the interaction between magnetic resonance imaging (MRI) procedures and tattoo pigments, some of which contain trace metals. The magnetic fields produced by MRI machines interact with these metals, including nonferrous metal particles, and while rare, are capable of causing first-degree or second-degree burns or distortions in the image. The type and density of the ink as well as shape of the tattoo may increase the risk, particularly if the shape approximates an RF pick-up loop. The television show MythBusters tested the hypothesis, and found a slight interaction between commonly used tattoo inks and MRI. The interaction was stronger with inks containing high levels of iron oxide.
The properly equipped tattoo studio will use biohazard containers for objects that have come into contact with blood or bodily fluids, sharps containers for old needles, and an autoclave for sterilizing tools. Certain jurisdictions also require studios by law to have a sink in the work area supplied with both hot and cold water.
Proper hygiene requires a body modification artist to wash his or her hands before starting to prepare a client for the stencil, between clients, and at any other time when cross contamination can occur. The use of single use gloves is also mandatory and disposed after each stage of tattooing. The same gloves should not be used to clean the tattoo station, tattoo the client, and clean the tattoo.
In some states and countries it is illegal to tattoo a minor even with parental consent, and (except in the case of medical tattoos) it is forbidden to tattoo impaired persons, people with contraindicated skin conditions, those who are pregnant or nursing, those incapable of consent due to mental incapacity, or those under the influence of alcohol or drugs.
Before the tattooing begins the client is asked to approve the final position of the applied stencil. After approval is given the artist will open new, sterile needle packages in front of the client, and always use new, sterile, or sterile disposable instruments and supplies, and fresh ink for each session (loaded into disposable ink caps which are discarded after each client). Also, all areas which may be touched with contaminated gloves will be wrapped in clear plastic to prevent cross-contamination. Equipment that cannot be autoclaved (such as countertops, machines, and furniture) will be wiped with an approved disinfectant.
Incentives for continuing education
Membership in professional organizations or certificates of appreciation/achievement generally help artists to be aware of the latest trends. Most tattooists do not belong to any association.
Training and certification requirements
While specific requirements to become a tattooist vary between jurisdictions, many mandate only formal training in blood borne pathogens and cross contamination. The local department of health regulates tattoo studios in many jurisdictions. For example, according to the health departments in Oregon and Hawaii, tattoo artists in these states are required to take and pass a test ascertaining their knowledge of health and safety precautions as well as the current state regulations. Performing a tattoo in Oregon without a proper and current license or in an unlicensed facility is a felony offense. Tattooing was legalized in New York City in 1997, and in Massachusetts and Oklahoma between 2002 and 2006.
Tattoo artists and people with tattoos vary widely in their preferred methods of caring for new tattoos. Some artists recommend keeping a new tattoo wrapped for the first 24 hours while others suggest removing temporary bandaging after two hours or less to allow the skin to breathe. Many tattooists advise against allowing too much contact with hot tub, pool water or soaking in a tub for the first two weeks to prevent the tattoo ink from washing out. In contrast other artists suggest that a new tattoo be bathed in very hot water early.
General consensus for care advises against removing the flakes or scab that may form on a new tattoo, and avoiding exposing one's tattoo to the sun for extended periods for at least 3 weeks; both of these can contribute to fading of the image. It is agreed that a new tattoo needs to be kept clean. Various products may be recommended for application to the skin, ranging from those intended for the treatment of cuts, burns and scrapes, to panthenol, cocoa butter, A&D, hemp, lanolin, or salves. Oil based ointments are almost always recommended for use on very thin layers due to their inability to evaporate and therefore over-hydrate the already perforated skin. Recent scientific studies have demonstrated that wounds that are kept moist heal faster than wounds healing under dry conditions. In recent years specific commercial products have been developed for tattoo aftercare. Although opinions about these products vary, soap and warm water work well to keep a tattoo clean and free from infection.
The amount of ink that remains in the skin throughout the healing process determines how the final tattoo will look. If a tattoo becomes infected or the flakes fall off too soon (e.g., if it absorbs too much water and sloughs off early or is picked or scraped off) then the ink will not be properly fixed in the skin and the final image will be negatively affected.
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