Article: Shading is an artistic endeavor - no instructions will be able to duplicate the confidence you'll gain by trying to shade yourself. Shading a tattoo is not so much different from shading a still life. Try to become comfortable shading off body, even if you are already an accomplished artist.  Practice with pressure. Pressing hard versus pressing lightly can have dramatically different effects, so you should get a feel for this ahead of time. Also, practice using different strokes to prepare yourself for tattooing different kinds of artwork. Pigs make good human analogues and you can buy a pork belly at a local grocery store or even online. This way you can get a feel for how much pressure to use and what type of strokes to use without worrying about permanently marking a human's skin just yet. Different shader needles result in different effects. For instance, bigger shader needles create a softer shade than smaller needles, which concentrate the color more. Ensure that the needle is protruding no more than 1 mm (0.039 in) for the purposes of shading. A slower speed helps create a softer shade that you can build upon. Using a faster speed creates darker shading. Adjust the speed as needed depending on what type of look and depth the customer wants. Clean the entire area with soap and water, especially if you have already done the lining. Make sure that you have gotten rid of any stencil marks, sticky residue, or grease that will get in the way of your shading process.
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Practice with paint or a pencil. Tattoo a pork belly for a more realistic feel. Choose an appropriate tattoo machine and needle size. Select the right speed on your tattoo machine to create the effect you're going for. Prepare the area.