Page 136 - Blog Posts v1

B7 - Laser tattoo treatments - how to treat ink colours - Part 2
I recently wrote a post about tattoo ink absorptions and how they vary across the wavelengths we use today (click here for that post). After that, I thought more about the relative fluences required to induce the desired reaction in ink colours.
I used the graph which I nicked off the internet (see below) – I don’t know where it came from. Any pointers would be gratefully received.
The above curves show that relative absorptions for five ink colours across part of the spectrum. I added the four main laser wavelengths used today – 532, 694, 755 and 1064nm (Nd:YAG, ruby and alex).
To estimate the required minimum fluences, I took the relative absorption for each wavelength and each colour, and calculated the relative ratios.
Assuming the threshold fluence for black ink at 694nm to be 2 J/cm2 (as per the Scheibner paper of 1990), I used this as the base point.
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