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A permanent tattoo consists of various colored particles. It can be removed with the help of lasers. Lasers emit light of different wavelengths. The colored particles absorb these wavelengths of light, get heated up and break into smaller pieces, making it easy for immune cells to eat and excrete them out, thus removing the tattoo.
Now, since every color absorbs a specific wavelength more than the other, different colors need different laser wavelengths. Black color is easiest to remove because it absorbs almost all wavelengths and breaks into smaller pieces. However, other colors like red, green, orange, blue, etc. require special lasers.
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