Markers come in a wide assortment of styles, and the ink and nibs used in each style will vary considerably. To determine which type of marker is best suited for your coloring project, first consider the artwork. Are the lines wide or thin, and are the coloring spaces small and intricate or more open? Fine-tip markers with firm nibs work well when coloring intricate designs. Wide nibs will work better to fill larger open spaces on your coloring page. Brush-tip markers can be used for most types of artwork depending on the thickness of the brushes.
There are many different types of ink used in markers including pigment, dye, water-based and alcohol-based to name a few. Because some inks will bleed through paper, be sure to protect your work surface or additional coloring pages by placing a sheet of scrap paper under the coloring page you are working on.