The practice or process of writing, marking, or creating images using one's own blood.
From Greek haima (blood) + autos (self) + -graphy (writing or description). This term is rare and appears primarily in historical, medical, or artistic discourse about unconventional marking practices.
Some forensic anthropologists have identified historical blood writing on documents—it's a gruesome reminder that before pens, people sometimes used what was immediately available to make permanent marks on surfaces.
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