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How did Inuit tattooing techniques use soot-coated thread?

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Inuit tattooing techniques, often referred to as skin stitching, involved a specific method of pigment application. Rather than simple pricking, practitioners would use a needle to make punctures in the skin, through which a thread coated in pigment—typically soot—was drawn underneath the surface. This process effectively embedded the soot into the skin to create permanent markings.1