What is a cover-up tattoo?
A cover-up (re-work) is a technique in which the original tattoo design is completely covered up. A cover-up (re-work) can transform a do-it-yourself carving or a tattoo that you don't like very much into a completely different tattoo that you are happy with.
What is touch-up?
Touch-up is a technique that corrects the lines and colours of the original tattoo, reapplying colour to areas where the colour has blown out or faded, or adding a new design.