Inks are thinner and more transparent than paints so they are only more visible as they collect up in the recesses of your model, which can be helpful for shading. Paint is simply used to achieve a base color for your model before shading and highlighting.
For example if one of your models was wearing tan-colored clothing and you know how cloth wrinkles when you move your arm or something..you would use ink that is darker than the cloth color (so it would be brown ink in this case) and fill in the recesses to get a fake shaded look.
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