An extra small black tattoo on the upper arm reached 75% fading after 17 sessions.

After 17 sessions at treatment.
The tattoo
An extra small black tattoo on the upper arm.
The upper arm is close to the axillary lymph nodes, which supports efficient clearance between sessions.
Bottom line
The last 5 to 10 percent of clearance is consistently the hardest phase: residual ink sits deepest, immune response slows, and the composition of what remains is unknown.