How your body holds onto ink for thousands of years
In short: Humans shed about 40,000 skin cells every hour, yet tattoos can endure for a lifetime—or even millennia. This video explains the biological mechanisms and cellular processes that allow these markings to remain permanent.
The video explores the transition of tattoo ink from the surface of the skin into the deeper layers where it becomes a lasting feature. It examines various methods and machines used to deposit pigment, as well as the specific role played by macrophages—immune cells that interact with the foreign substance.
By understanding these processes, we can see how tattoos survive the constant renewal of our outer skin. The history of the practice is also touched upon, noting that some of the earliest recorded examples date back to 6,000 BC.
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Sources
- Summary by Intellect · source: What makes tattoos permanent? - Claudia Aguirre
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