A tattoo black and blue tattoo on the upper arm reached 75% fading after 4 sessions at Removery over 2 years.

After 4 sessions at Removery.
The tattoo
A medium black and blue tattoo on the upper arm, 1–5 yrs old when treatment began.
The upper arm is close to the axillary lymph nodes, which supports efficient clearance between sessions.
Timeline
4 sessions over 2 years.
Sessions were spaced 10 weeks apart.
Cost
Removery did not share a total cost. For reference, the average per-session rate in Portland runs $133 to $399, which would put a 4-session treatment in the $532 to $1,596 range.
The laser
Removery treated this case with the Picoway, a picosecond platform.
For black and blue ink, it operates at 1064 nm with a pulse duration of 240 - 450 ps.
For black and blue ink, it operates at 785 nm with a pulse duration of 300 ps.
Mike from GO describes PicoWay as a monster on black ink, and it is his personal choice for black ink removal.
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.
Similar cases in the gallery: Large Multicolor Upper Arm Tattoo: 50% Fading After 5 Sessions at Removery — Black Chest Tattoo: 50% Fading With a Candela PicoWay