What factors contribute to the remaining 10% of tattoo removal difficulty?

The difficulty of tattoo removal can be significantly influenced by the amount of ink used and the colors involved in the tattoo. Darker inks, such as black, typically absorb laser light more effectively and can be removed more easily. In contrast, lighter colors like green and yellow can be more challenging to eliminate because they absorb less laser energy. Additionally, the depth of ink deposited in the skin and the overall saturation of the colors can affect how effectively the laser can break down the ink particles.

While other factors such as skin type, client pain threshold, and the tattoo's placement certainly play important roles in the removal process, the specific focus on the amount of ink and the colors used directly correlates to how responsive the tattoo is to laser treatments. Therefore, this choice effectively captures a critical aspect of tattoo removal difficulty related to the physical properties of the ink itself.