Working Soft

Part of Leatherwork

Softening and breaking in stiff leather for comfortable, flexible use.

Why This Matters

Freshly tanned leather is often stiff, board-like, and unsuitable for many applications. Vegetable-tanned leather in particular emerges from the tanning pit as a rigid material that would make terrible gloves, uncomfortable boots, and unwearable clothing. The process of softening leather — called “working” or “breaking” — transforms this stiff material into something supple and flexible that conforms to the human body and moves with it.

In a rebuilding scenario, most of the leather you produce will need softening before it’s useful. Boot leather needs enough give to flex with every step. Glove leather must bend freely with finger movements. Bag leather should fold and drape rather than standing rigid. Even belt leather benefits from some working to prevent it from digging into the wearer. Without softening, tanned leather is essentially a rigid panel — useful for shield covers and sole leather, but little else.

The softening process is straightforward but physically demanding. It involves mechanically breaking the bonds between collagen fibers that formed during drying, then keeping those fibers separated with oils or fats. Understanding the mechanics of softening lets you achieve the right degree of flexibility for each application — from the stiffness needed for a knife sheath to the butter-soft drape needed for a shirt.

How Leather Becomes Stiff

Understanding why leather stiffens explains how to soften it effectively.

During tanning, collagen fibers are chemically stabilized. When the leather dries, water between these fibers evaporates. As moisture leaves, the stabilized fibers settle against each other and form weak hydrogen bonds between adjacent strands — like wet hair clumping together as it dries. These bonds lock the fibers in place, creating a rigid matrix.

Softening leather means breaking these inter-fiber bonds and preventing them from re-forming. There are two components:

1. Mechanical action — physically moving, stretching, and flexing the leather to break the fiber-to-fiber bonds.
2. Lubrication — introducing oils or fats between fibers to keep them sliding freely and prevent re-bonding.

Both components are necessary. Mechanical action alone produces temporary softness — the leather stiffens again as fibers re-bond during the next drying cycle. Oils alone don’t penetrate stiff, compressed fibers effectively. The combination — working the leather while it absorbs lubricant — produces lasting softness.

Softening Methods

Staking

The oldest and most universal softening technique. Staking involves pulling leather back and forth over a rounded edge, which stretches and flexes the fibers at the contact point.

Building a staking post:

1. Find or shape a stake — a smooth, rounded piece of hardwood or bone, approximately 8-10cm wide with a convex top edge.
2. Mount it vertically at waist to chest height (a post set in the ground, or a piece clamped to a workbench).
3. The working edge should be smooth and rounded — any sharp edges will tear the leather.

Staking technique:

1. Dampen the leather slightly. It should be flexible but not wet — the damp state is called “cased.” Mist with water or wrap in damp cloth for 30 minutes.
2. Drape the leather over the stake, grain side down.
3. Grip both sides and pull the leather back and forth across the rounded edge, applying downward pressure.
4. Work systematically across the entire surface, not just one spot.
5. Rotate the leather 90 degrees and repeat, so fibers are worked in both directions.
6. Continue until the leather feels uniformly flexible.

Hand Working

For smaller pieces or areas that the stake can’t reach:

1. Dampen the leather to the cased state.
2. Grip the leather in both hands and work it like kneading bread — pull, twist, fold, and stretch in all directions.
3. Pull sections across your knee or the edge of a table.
4. Accordion-fold the leather repeatedly, pressing the creases with your hands.
5. Roll the leather tightly, press, unroll, and re-roll from a different direction.

This is exhausting work for large pieces. Brain tanning traditions involve hours of hand-working, often shared among community members.

Timing Is Everything

The leather must be at the right moisture level during working. Too wet and the fibers slip without breaking bonds. Too dry and the leather resists flexing and may crack. The ideal state is when the leather feels cool and flexible but doesn’t leave moisture on your hands when squeezed.

Tumbling

A less labor-intensive method for softening multiple pieces:

1. Place leather pieces in a large cloth bag or barrel with smooth wooden balls or rounded stones (approximately fist-sized).
2. Agitate by shaking, rolling the barrel, or suspending and swinging it.
3. The weight of the balls flexes and stretches the leather randomly in all directions.
4. Continue for 30-60 minutes. Check softness periodically.

In a rebuilding scenario, a simple tumbling drum can be made from a barrel mounted on an axle, turned by hand or water power. This method can process multiple hides simultaneously with minimal labor.

Cable Softening

Pull the leather back and forth around a taut cable or rope:

1. Stretch a smooth rope or cable (braided leather works well) between two fixed points at chest height.
2. Drape the leather over the cable.
3. Pull the leather back and forth, moving your working position along the cable to cover the entire hide.
4. The round cable profile works similarly to a staking post but allows longer runs of continuous motion.

The Role of Oils in Softening

When to Oil

Oil should be applied during or immediately after mechanical working, while the fibers are still separated and receptive. The sequence:

1. Dampen the leather.
2. Begin mechanical working (staking, hand-working, etc.).
3. After 5-10 minutes of working, when the leather begins to feel more pliable, apply oil to the flesh side.
4. Continue working to drive the oil into the fiber structure.
5. Apply more oil as it absorbs. The leather will initially absorb oil quickly, then slow as fibers saturate.
6. Continue working until the leather reaches desired softness.

Oil Selection for Softening

Oil	Softening Effect	Notes
Neatsfoot oil	Excellent — deep penetration	Best general-purpose softening oil
Brain emulsion	Excellent — traditional method	Each animal’s brain is roughly enough to tan its own hide
Rendered tallow	Good — moderate penetration	Apply warm; too thick when cold
Lanolin	Excellent — very compatible with skin	Extract from raw wool
Egg yolk	Good — natural emulsifier	Mix with warm water for brain-like emulsion
Fish oil	Very good — deep penetration	Strong odor, best for heavy-use items

Brain Tanning Connection

The famous brain-tanning process is essentially an extreme version of oil-during-working. Brain tissue is rich in lecithin — a natural emulsifier that creates a creamy suspension of fats in water. This emulsion penetrates deep into wet leather fibers. Combined with vigorous working, it produces the softest leather achievable without industrial chemicals.

Brain emulsion recipe:

1. Remove the brain from a fresh animal skull (approximately 150-200g for a deer).
2. Mash thoroughly in warm water (about 1 liter) until you have a smooth, milky suspension.
3. Alternatively, if no brain is available, substitute with a mixture of egg yolks (3-4) blended into warm water, or mashed liver.
4. Soak the damp hide in this emulsion for several hours or overnight.
5. Wring out and begin staking/hand-working while still damp with the emulsion.
6. Repeat the soaking and working cycle 2-3 times for maximum softness.

Controlling Softness Level

Not all leather should be maximally soft. Different applications require different levels of firmness:

Soft (Garment Grade)

• Extensive staking and hand-working (2-3 hours for a deer hide)
• Heavy oiling throughout the process
• Brain tanning or equivalent emulsion treatment
• Smoke finishing to lock in softness
• Result: drapes like heavy fabric, suitable for clothing, gloves, bags

Medium (General Purpose)

• Moderate staking (30-60 minutes for a deer hide)
• Standard oiling (neatsfoot or tallow)
• Result: flexible but holds shape, suitable for belts, pouches, boot uppers

Firm (Structural)

• Light staking or hand-working (15-20 minutes)
• Light oiling, surface treatment only
• Result: bends but springs back, suitable for sheaths, cases, armor backing

Rigid (Sole/Shield Grade)

• Minimal or no softening work
• Surface oiling only for weather protection
• Result: stiff panel, suitable for boot soles, shields, hard cases

Troubleshooting

Leather cracks during working: It’s too dry. Re-dampen with a light mist of water, wait 15 minutes for the moisture to penetrate, and resume working more gently.

Leather re-stiffens after softening: Not enough oil was applied during working. Re-dampen, apply more oil, and work again. The oil prevents fiber re-bonding during drying.

Uneven softness (soft in some areas, stiff in others): You didn’t work the entire surface evenly. Mark the stiff areas and concentrate staking on those zones. Thicker areas of the hide need more working than thinner areas.

Leather becomes spongy or weak: Over-worked or over-oiled. This leather has lost structural integrity. It’s still usable for non-structural applications (lining, wrapping) but not for items under stress. There’s no fix — use what you can and learn the limits for next time.

Surface feels gummy after oiling: Too much oil applied at once, or the oil didn’t have time to absorb before more was added. Blot excess with clean dry cloth, then continue working. The mechanical action will help distribute the oil into the fiber structure.

Maintaining Softness Over Time

Softened leather gradually stiffens with use and exposure:

• Re-oil periodically — Monthly for daily-use items, every 3-6 months for stored goods.
• Avoid excessive wetting followed by heat drying — This is the primary cause of re-stiffening in use. If leather gets wet, let it dry slowly at room temperature, flexing it periodically as it dries.
• Store properly — Flat or hanging, in moderate humidity. Leather stored in very dry conditions loses moisture and stiffens. Leather stored damp grows mold.
• Re-work if needed — If leather has stiffened in storage, dampen it, apply oil, and hand-work for 10-15 minutes. It won’t reach its original softness but will improve significantly.