The tattoo artist fills in a tattoo using a thicker needle. See the needle in action. The tattoo itself involves several steps: Outlining: Using a single-tipped needle and a thin ink, the artist creates a permanent line over the stencil.
http://www.mydepots.com/docs/tattoo/how-to-tattoo-professional-guide.pdf
For instance, tattoo needle 1204RL could also be called #12 4-Round Liner Needles. Either way a tattoo needle is described, each piece of the code or name refers to a different aspect of the needle: tattoo needle diameter, needle count and grouping format.
http://info.painfulpleasures.com/blogs/understanding-tattoo-needles
That means that 1204RL tattoo needles have a #12, or .35mm, diameter. #12 is one of the larger-diameter needle sizes available and the most commonly used size. By comparison, #10, or 0.30mm, is the size tattoo artists most often like to use when doing lining work. You can also purchase larger #13 needles that have a 0.40mm diameter, smaller #8 needles, which have a 0.25mm diameter, or really fine-diameter #6 tattoo needles, which are 0.20mm in size.
http://info.painfulpleasures.com/blogs/understanding-tattoo-needles
Tattooing is the practice of adding ink into the skin to add art to the body. It has been a means of personal expression for centuries. The first tattoo needles were used in the year 1891 as it was discovered that the stencil pen could be used to infiltrate ink into the skin.
http://www.ebay.com/gds/Tattoo-Needles-Buying-Guide-/10000000177405010/g.html
Tattoo artists may have a preference when it comes to shading needles. Some may use a round shading needle setup. The most common tip counts used for round shading clusters are 3, 5, 7, and 9. Magnum shading needles are the most common for this application due to the double-stacked construction and flat tips.
http://www.ebay.com/gds/Tattoo-Needles-Buying-Guide-/10000000177405010/g.html
The clusters have a tube size that matches the number of needles in the cluster, or gauge. With this construction in mind, each needle size has a suggested use. Some artists may vary and use one gauge size for an entire tattoo while others may switch needles two or more times in one tattoo. Below is a chart outlining round needle gauge sizes, the matching tube size, and the use for that specific needle.
http://www.ebay.com/gds/Tattoo-Needles-Buying-Guide-/10000000177405010/g.html
Whether a tattoo supplier uses a format like 1204RL or just a 2-digit number at the beginning of a tattoo needle product name (ex. #12 Standard Round Liner Premade Sterilized Tattoo Needles on Bar-Box of 50), the leading number always refers to the diameter of the needle.
http://info.painfulpleasures.com/blogs/understanding-tattoo-needles
You shouldn't hesitate to walk away if a tattoo artist seems defensive, angry, or is unwilling to show you what you’re asking to see. Seek out a tattoo artist who is willing to explain their process and follow safety guidelines. Check Their Style. Ask to see examples of the artist’s finished work.
http://www.nakedtruth.idaho.gov/Tattoos.aspx
There is important information you should know if you are considering getting a tattoo or body piercing. Most important is that Hepatitis B, Hepatitis C and HIV are some diseases a person could possibly get from contaminated equipment. Plan Ahead. Some people regret a quick decision to get a tattoo or body piercing, so allow plenty of time to visit various tattoo shops and meet the artists. To keep your good health, take a little time to know the process so you can make a safe decision.
http://www.nakedtruth.idaho.gov/Tattoos.aspx
While puncturing the skin, tattoo ink in the needles will be injected into the outer layer of skin and new tattoos come into being. Tools needed Professional and good quality tattoo kit Details about specifications and components, refer to MYDEPOTS-your professional tattoo kit guide.
http://www.mydepots.com/docs/tattoo/how-to-tattoo-professional-guide.pdf
what millimeter needles do tattoo artists use
The tattoo artists use 0.30  millimeter needles. Tattoo artists use 0.30 millimeter needles.