The Outline

Traditional tattoo methods include an outline. The outline is typically
done with outlining inks, which have less alcohol in them
than normal pigments. Sometimes the outlining inks are not
even tattoo pigments at all, but this was touched on in the section
about pigment. It is important to approach each tattoo as a
piece of artwork. If you are working from flash or a pre-printed
tattoo design, you will probably attempt to recreate every detail
of the flash. This would include the line weight, meaning how
thick the lines are.