Leatherwork
Why This Matters
Before textiles, before metal armor, before plastic — there was leather. It is waterproof, windproof, abrasion-resistant, and flexible. A pair of leather boots protects your feet for years. A leather bag carries water without leaking. A leather apron shields you from forge sparks. A leather belt transmits mechanical power. In a rebuilding scenario, leather is available immediately from any hunted or butchered animal, and the tanning process requires no metal tools, no fire (for brain tanning), and no purchased chemicals. Every animal you kill provides both food and this critical material. Wasting hides is wasting civilization.
What You Need
For skinning and fleshing:
- A sharp knife (stone, bone, or metal)
- A fleshing beam — a smooth, rounded log about 1.5 meters long, 15-20 cm diameter, set at a 45-degree angle with one end on the ground and the other at waist height
- A fleshing tool — a dull blade, the back of a knife, a rib bone, or a draw knife
For brain tanning:
- The brain of the animal (every mammal has enough brain to tan its own hide — this is a genuine biological fact, not folklore)
- A bucket or container for the brain solution
- A frame for stretching (four poles lashed into a rectangle, or a simple A-frame)
- Cordage for lacing the hide into the frame
- A smoking setup: a small fire pit with a tripod or frame to drape the hide over
For bark/vegetable tanning:
- Oak bark, hemlock bark, chestnut bark, or other tannin-rich bark (see Tannin Sources below)
- An axe or knife for stripping bark
- 2-3 large containers or pits for soaking (wooden barrels, clay-lined pits, or large pots)
- Time — bark tanning takes 2-12 months
For sewing leather:
- An awl (a sharp pointed tool — bone, thorns, or metal)
- Needles (bone needles, metal needles, or thorns)
- Thread (sinew is ideal; strong plant fiber or thin leather lacing also works)
Step 1: Skinning the Animal
Speed matters. Begin skinning within 1-2 hours of the kill. Once a hide dries on the carcass, it becomes extremely difficult to remove cleanly.
Step 1 — Hang the carcass head-down from a branch or frame if possible. If not, lay it on its back on clean ground.
Step 2 — Make a long cut down the belly from throat to tail. Do not cut deep — you only need to penetrate the skin, not the underlying muscle. Angle your blade edge upward (away from the meat) to avoid nicking the hide.
Step 3 — Make cuts down each leg from the belly cut to the hooves/paws.
Step 4 — Starting at the belly cut, work your fingers and fist between the skin and the underlying membrane. On most animals, the hide separates fairly easily with pulling and occasional knife work at connective tissue points. Work from the belly toward the back.
Step 5 — At the head, legs, and tail, cut through the skin and separate. You now have a flat hide, flesh side up.
Step 6 — If you cannot tan immediately, preserve the hide by one of these methods:
- Salting (best): Spread hide flesh-side up, cover with a 1-cm layer of non-iodized salt. Roll up, store in shade. Keeps 2-4 weeks.
- Drying (acceptable): Stretch hide on a frame in shade. Let it dry completely. It becomes stiff as a board but can be rehydrated for tanning later.
- Freezing (if available): Roll and freeze. Keeps indefinitely but requires thawing before tanning.
Step 2: Fleshing
Fleshing removes all the fat, meat, and membrane from the inside of the hide. Any material left behind will rot, causing bald spots and weakness.
Step 1 — If the hide has been salted or dried, rehydrate it by soaking in clean water for 12-48 hours until it is soft and pliable again.
Step 2 — Drape the hide over the fleshing beam, hair side down, flesh side up.
Step 3 — Using your fleshing tool (dull blade, draw knife, or rib bone), scrape downward from the center of the hide toward the edges. Apply firm, even pressure. You are removing the white/pink membrane (the hypodermis) and any attached fat or meat.
Step 4 — Work the entire surface until the flesh side is uniformly clean — slightly rough, off-white, with no shiny membrane remaining. This typically takes 30-60 minutes for a deer-sized hide.
Step 5 — For brain tanning, you also need to remove the hair. There are two approaches:
Dry scraping (harder but faster): Drape the hide hair-side up over the beam. Scrape the hair off using a sharp-edged tool (a sharpened bone, the edge of a stone, or a draw knife). Scrape in the direction of hair growth. This is physically demanding but can be done immediately.
Wet scraping / bucking (easier but takes days): Soak the hide in a solution of hardwood ash and water (wood ash lye) for 3-7 days. The alkaline solution loosens the hair follicles. Check daily — when the hair pulls out easily with a gentle tug, remove the hide, drape over the beam, and scrape the hair off. It will come off much more easily than dry scraping. Rinse thoroughly after dehairing to remove all lye residue.
Method 1: Brain Tanning (Produces Soft, Washable Buckskin)
Brain tanning is the oldest and most accessible tanning method. It produces a soft, supple, golden-colored leather called “buckskin” that is comfortable against the skin and naturally breathable. The secret ingredient is the emulsified oils in animal brains, which penetrate the hide fibers and prevent them from bonding rigidly as they dry.
The Biology Behind It
Every mammal has roughly enough brains to tan its own hide. A deer brain weighs about 300 grams — enough for one deer hide. This is not coincidence; it is biology. The lecithin and phospholipids in brain tissue are natural emulsifiers — they coat the collagen fibers in the hide and keep them lubricated, preventing the stiff bonding that makes rawhide.
Preparing the Brain Solution
Step 1 — Take the brain (fresh, frozen, or dried — dried brains stored for months still work). If using a deer, one brain is approximately enough for one hide. For larger animals (elk, cow), you may need brains from two animals.
Step 2 — Mash the brain thoroughly with your hands or a tool until it is a smooth paste. No lumps — every bit of brain tissue needs to be broken down.
Step 3 — Mix the brain paste into approximately 2 liters of warm water (not hot — about 40-50 degrees C, comfortable to touch). Stir until you get a uniform, milky liquid. This is your tanning solution.
Alternative brain sources if the animal’s brain is damaged: egg yolks (about 12 yolks per deer-sized hide) or animal liver blended into a paste work as substitutes. They contain similar emulsifying lipids.
Braining the Hide
Step 4 — Wring the fleshed and dehaired hide to remove excess water. It should be damp but not dripping.
Step 5 — Submerge the entire hide in the brain solution. Work the solution into the hide by kneading, squeezing, and rubbing for at least 15-20 minutes. Make sure every square centimeter is saturated.
Step 6 — Let the hide soak in the brain solution for at least 2-4 hours. Overnight is better. Some tanners soak for 24 hours and report softer results.
Step 7 — Remove the hide and wring it out thoroughly. Wring by twisting — twist one end while a partner twists the other in the opposite direction, or wrap around a smooth stick and twist against a post. Squeeze out as much liquid as possible.
Step 8 — Repeat Steps 5-7 at least one more time. Two braining sessions are minimum. Three is better. Each session drives more brain oils deeper into the fibers. You can tell the hide is sufficiently brained when, after wringing, the surface looks uniformly white and opaque rather than having translucent patches.
Softening (The Hard Part)
This is the most labor-intensive step. You must keep the hide moving and stretching as it dries. If any section dries without being stretched, that section becomes stiff rawhide and cannot be recovered without re-braining.
Step 9 — Lace the hide into your stretching frame using cordage threaded through holes punched every 10-15 cm around the entire edge. Pull the hide tight — like a drumhead.
Step 10 — As the hide dries, continuously work every part of the surface. Push and stretch with a rounded stick or smooth bone tool (a “softening stake” — a stick about 60 cm long with a rounded, smooth end). Work systematically, covering every area. Pay special attention to thick areas (the neck, the backbone strip) — these dry slowest and stiffen fastest.
Step 11 — Continue working the hide for 4-8 hours. In warm, dry weather it dries faster (more intense work); in cool, humid weather it dries slower (longer but easier work). You are done when the entire hide is dry, soft, and uniformly white/golden. If you find stiff spots, re-dampen them with brain solution and rework.
An alternative to frame stretching: rope or cable the hide over a taut rope or smooth pole and pull it back and forth, working different sections. This is faster but gives less control.
Smoking (The Critical Finish)
Without smoking, brain-tanned leather reverts to rawhide if it gets wet and dries without being re-stretched. Smoking deposits aldehydes from wood smoke into the fibers, creating permanent cross-links that maintain softness even after wetting.
Step 12 — Sew the hide into a bag or cone shape — fold in half, hair grain side in, and sew the edges shut with sinew or cord. Leave one end open.
Step 13 — Dig a small fire pit about 30 cm wide and 30 cm deep. Build a small fire using dry hardwood. Let it burn down to a bed of coals. Add punky (rotten) wood, green wood, or damp hardwood chips to create dense, cool smoke. You want thick smoke, not heat or flames. If you see flames, smother them.
Step 14 — Suspend the open end of the hide bag over the pit using a tripod of sticks or a frame. The smoke should fill the bag. Prop the bag open if needed to maintain airflow.
Step 15 — Smoke until the hide turns a golden to dark brown color throughout — check the inside of the bag, not just the outside. This typically takes 30-60 minutes per side. Then turn the bag inside-out and smoke the other side for equal time.
Step 16 — Your brain-tanned, smoked buckskin is now complete. It is soft, washable (it can be hand-washed and will dry soft without re-working), and resistant to rot. It will last for years with normal use.
Method 2: Bark Tanning (Vegetable Tanning — Produces Firm, Thick Leather)
Bark tanning produces a firmer, stiffer, more water-resistant leather than brain tanning. It is ideal for shoe soles, belts, holsters, sheaths, saddles, armor, and any application needing structural rigidity. It takes much longer (weeks to months) but requires less physical labor per day.
Tannin Sources
Tannins are chemicals found in many plants that bind to collagen fibers and permanently preserve them. The best sources:
| Source | Tannin Content | Notes |
|---|---|---|
| Oak bark (inner bark) | High | The classic tanning material; available nearly everywhere |
| Hemlock bark | High | Produces reddish-brown leather |
| Chestnut bark and wood | Very high | Excellent if available; fast-acting |
| Mimosa/wattle bark | Very high | Tropical/subtropical regions |
| Sumac leaves | High | Fast-acting; good for light hides |
| Tea (Camellia sinensis) | Medium | Useful in small quantities |
| Acorn caps | Medium | Supplement if bark is scarce |
| Pomegranate rind | Medium | Produces pale leather |
Preparing the Tan Liquor
Step 1 — Collect bark in spring when the sap is flowing — it peels most easily and has the highest tannin content. Strip the inner bark (the pinkish/reddish layer between the hard outer bark and the wood). You need roughly 5-10 kg of bark per hide.
Step 2 — Chop or shred the bark into small pieces (1-3 cm). The smaller the pieces, the faster the tannins dissolve.
Step 3 — Fill a large container (wooden barrel, clay-lined pit, or large pot) about one-third full of bark. Fill with water. Let it steep for 1-2 weeks, stirring occasionally. The water will turn dark brown — this is your tanning liquor.
Step 4 — For best results, prepare three strengths of tanning liquor:
- Weak: The first soak liquor, about 1 week old
- Medium: 2-3 weeks old, stronger color
- Strong: 4+ weeks old, very dark, concentrated
The Tanning Process
Step 5 — Take your fleshed and dehaired hide (prepared as in Step 2 above). Rinse thoroughly if you used lye for dehairing.
Step 6 — Submerge the hide in the weakest tanning liquor. Ensure the hide is completely covered and does not fold on itself (tannin needs to contact every surface evenly). Weight it down with a clean rock or wooden float.
Step 7 — Leave for 1-2 weeks, stirring and repositioning the hide daily to ensure even tanning.
Step 8 — Move the hide to the medium-strength liquor. Leave for 2-4 weeks, stirring and repositioning every few days.
Step 9 — Move to the strongest liquor. At this stage, you can also pack fresh bark directly against the hide surfaces — alternate layers of bark and hide, then cover with tanning liquor. Leave for 4-8 weeks.
Step 10 — The hide is fully tanned when you cut a small sliver from the thickest part (the neck) and it is the same color all the way through — no pale or translucent center. If the center is still pale, return to the strong liquor for more time.
Step 11 — Remove from the liquor and rinse in clean water for 1-2 hours to remove excess tannin from the surface. Hang in shade to dry slowly. Do not dry in direct sunlight — it causes cracking and uneven shrinkage.
Step 12 — When partly dry (the “cased” stage — still somewhat flexible), apply a thin coat of oil or fat (neatsfoot oil, lard, tallow, or any animal or vegetable oil) to both sides. Work it in by hand. This is called “fat liquoring” and keeps the leather from becoming too stiff.
Step 13 — Continue drying in shade. When dry, the leather will be firm, smooth, and a rich brown color. It is now ready for cutting and sewing.
Total time from raw hide to finished bark-tanned leather: 2-6 months depending on hide thickness and tannin strength.
Cutting and Sewing Leather
Cutting
- Always use the sharpest knife available. A dull knife tears leather fibers rather than cutting them cleanly, which weakens the edge.
- Cut on a smooth, hard surface (a flat stone, a piece of smooth wood, or a thick piece of scrap leather as a cutting board).
- For straight lines, use a straightedge (a wooden ruler, a straight stick, or a stretched cord as a guide).
- Cut from the back (flesh side) whenever possible — the smooth grain side shows any slip of the blade.
Punching Holes
You cannot push a needle through thick leather without a pre-punched hole. Use an awl (a sharp pointed tool):
Step 1 — Mark your stitch line with a light scratch, about 3-5 mm from the edge.
Step 2 — Push the awl through at regular intervals — about 3-5 mm apart for fine work, 5-8 mm for heavy work.
Step 3 — Angle the awl slightly (about 30 degrees from perpendicular) so the stitches will sit at an angle in the leather. This is called a “saddler’s stitch” and is much stronger than perpendicular holes.
Sewing with Sinew
Sinew (dried tendon from the leg or back of any large animal) is the best natural thread for leather. When dry, it is strong as cord. When wet, it is slightly sticky and shrinks as it dries, tightening every stitch.
Step 1 — Dry sinew thoroughly, then pound it with a rock or mallet to separate the fibers.
Step 2 — Pull off individual fibers or thin bundles. Twist slightly between your fingers to form a thread. The thickness should be appropriate to the hole size.
Step 3 — Wet the sinew lightly (saliva works fine) to make it flexible and sticky.
Step 4 — Thread through a bone or metal needle (or use the awl itself as a needle). Sew using a running stitch or saddle stitch.
Saddle stitch (strongest): Use two needles, one on each end of the sinew. Pass the first needle through the hole front-to-back. Pass the second needle through the same hole back-to-front. Pull both tight. This creates a lock at every stitch — if one stitch breaks, the others hold.
Making Essential Leather Goods
Shoes/Moccasins
Step 1 — Stand on a piece of leather and trace your foot with about 2 cm of extra material all around.
Step 2 — Cut out the sole. For hard-soled shoes, use bark-tanned leather (firm). For soft moccasins, use brain-tanned buckskin.
Step 3 — Cut a rectangular piece for the upper — long enough to wrap around your foot from the sole edge over the top, with 3-4 cm overlap for sewing.
Step 4 — Wet the upper and mold it over your foot. Mark and trim where the pieces meet. Punch holes and sew the upper to the sole with the seam on the outside (prevents the seam from rubbing your foot). Use sinew or waxed thread.
Step 5 — Add a tongue piece to cover the gap at the top. Attach laces through punched holes.
Water Containers
Brain-tanned leather, smoked, can be sewn into a water bag. However, for a truly waterproof container:
Step 1 — Sew a bag from bark-tanned leather, stitching with sinew using tight saddle stitch.
Step 2 — Coat the inside seams with melted pine pitch or beeswax to seal them.
Step 3 — Fill with water and let it soak for several hours — the leather swells and the seams tighten. The bag may weep slightly at first but will seal as the leather absorbs water and expands.
Alternatively, shape wet bark-tanned leather over a form and let it dry into a rigid container (this is how leather bottles and jacks were historically made). Sealed with pitch on the interior, these hold water indefinitely.
Common Mistakes
| Mistake | Why It’s Dangerous | What to Do Instead |
|---|---|---|
| Waiting too long to skin | Hide rots on the carcass; hair slips, skin weakens | Skin within 1-2 hours of kill; preserve immediately if not tanning right away |
| Leaving membrane during fleshing | Leftover membrane blocks tanning chemicals; causes bald spots and rot | Scrape until the entire flesh side is uniformly clean with no shiny patches |
| Skipping the smoking step (brain tan) | Leather reverts to stiff rawhide when it gets wet | Always smoke both sides until golden-brown throughout |
| Letting brain-tanned hide dry without stretching | Stiff patches form that cannot be recovered without re-braining | Work the hide continuously during the entire drying period — 4-8 hours |
| Too little braining | Insufficient oil penetration; leather is stiff even after stretching | At least 2 braining sessions; 3 is better. Soak overnight each time. |
| Bark tanning too fast | If you start in strong tannin, the surface tans before the interior — “case hardening” | Always start in weak liquor and progress to strong over weeks |
| Drying bark-tanned leather in direct sun | Causes cracking, warping, and uneven shrinkage | Dry in shade with good air circulation |
| Sewing with wet sinew through small holes | Sinew jams and breaks; stitches are uneven | Punch holes first with an awl, then sew. Use only slightly damp sinew. |
What’s Next
Leather connects to several other skills:
- Textiles & Weaving — leather complements woven fabrics for reinforcement, straps, and mixed-material garments
- Metalworking — leather aprons, bellows, and tool handles
- Knots & Cordage — leather lacing serves as strong, durable cordage
Quick Reference Card
Leatherwork — At a Glance
Rule of thumb: Every animal has enough brains to tan its own hide.
Method Time Result Best For Brain tanning 2-4 days active work Soft, golden buckskin Clothing, bags, soft goods Bark tanning 2-6 months (mostly waiting) Firm, brown leather Shoes, belts, holsters, armor Process overview:
- Skin within 1-2 hours (or preserve with salt/drying)
- Flesh — remove all membrane and fat
- Dehair — scrape dry or soak in wood ash lye 3-7 days
- Tan — brain (2-3 sessions, soak overnight each) OR bark (weak to strong liquor over months)
- Soften (brain tan) — stretch continuously as it dries, 4-8 hours
- Smoke (brain tan) — 30-60 min each side until golden-brown throughout
- Oil (bark tan) — apply fat when partly dry
Sewing: Punch holes with awl first. Use sinew thread. Saddle stitch (two needles) is strongest.
Preservation: Salt (2-4 weeks), dry on frame (months), or freeze (indefinitely).