A fresh black tattoo cannot be covered up. The ink is too dark and would show through a new tattoo. An old or faded black tattoo can be covered up easily after the person with the tattoo undergoes several laser removal treatments.
A tattoo used to cover an unwanted one is normally larger than the original, but size is not the only matter to consider when attempting to cover an old tattoo completely. Black tattoos have a higher chance of showing through a cover-up tattoo. Some tattoo artists are better than others at covering black tattoos. For this reason, it is important to choose an experienced professional to perform this procedure.