braintanning

Brain tanning, or brain-tanning, is a traditional method of tanning animal hides using brain tissue as a natural tanning agent. The brain, typically from the animal the hide came from, is emulsified with water and sometimes other materials to coat the hide. The emulsion helps penetrate and lubricate collagen fibers, producing a soft, durable buckskin or leather.

Historically, many Indigenous peoples of North America used brain tanning to produce soft hides for garments, bags, and other items. The technique also appeared in other cultures as a practical, low-cost method before modern chemical tanning processes became widespread.

Process overview: After removing hair and fleshing the hide, the hair is removed (dehair) by soaking or scraping; the hide is then treated with the brain-emulsion mixture, sometimes combined with salt or ash to aid preservation. The hide is worked by hand and stretched during drying to keep it pliable, and finishing steps may include smoking, oiling, or rubbing to improve softness and water resistance.

Safety and modern practice: Handling brain tissue carries biohazard risks, including prion-related diseases in some species. Modern practitioners often use brains from healthy animals or alternative tanning agents, and jurisdictions may caution against or regulate the use of brain tissue. Today, brain tanning is maintained by some Indigenous communities and craft enthusiasts as a traditional skill and cultural heritage, frequently taught within communities or by artisans.