Page 75 - Chapter 3 - Laser/IPL Hair Removal
P. 75
Chapter 3 – Fundamentals of Laser/IPL Hair Removal 2nd Edition
Figure 38 – Absorption curves for skin tones 1 and 6
However, the brown hair melanin is stronger than the ST1 pale skin melanin concentration, thereby making it a suitable target for light therapy. Once the melanin concentration in the hair drops below a certain level, equal to the concentration in ST1, then those hairs become difficult to treat since they no longer have a preferential absorption of the light.
Figure 39 - Absorption curves for skin tones 1 and 6
The curves above in Figure 39 show clearly why we cannot treat blond, or lighter hairs – they simply cannot absorb enough light energy to generate the temperatures required for the job.
________________________________________________________________________ 75 Chapter 3, Ed. 2.0 Laser/IPL Hair Removal
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