When it comes to leather, not all tanning methods are created equal. The process used to transform raw hide into leather has a profound impact on the final product - its feel, durability, ageing characteristics, and environmental footprint. At LW Leatherworking, we work predominantly with vegetable-tanned leather, and for good reason. Here's a clear breakdown of the two most common tanning methods so you can make an informed choice.

What Is Tanning?

Tanning is the process of treating raw animal hides to prevent decomposition and transform them into durable, workable leather. Without tanning, hides would simply rot. The tanning agent used determines almost everything about the leather's character.

Vegetable Tanning

Vegetable tanning - or veg-tan - is one of the oldest crafts in human history, dating back thousands of years. It uses natural tannins derived from plant matter: tree bark (typically oak, chestnut, or mimosa), leaves, and other botanical sources.

The Process

Hides are slowly immersed in a series of tanning pits filled with increasingly concentrated tannin solutions. This process takes weeks or even months, allowing the tannins to fully penetrate the hide and bond with the collagen fibres.

Characteristics of Vegetable-Tanned Leather

• Develops a rich patina over time - the leather darkens and deepens with use, becoming uniquely yours.
• Firm and structured - ideal for belts, wallets, holsters, and goods that need to hold their shape.
• Natural, earthy tones - takes dyes beautifully and ages with warmth.
• Biodegradable - made with natural materials, it breaks down at end of life.
• Repairable and long-lasting - with proper care, veg-tan goods can last decades.

Drawbacks

• More expensive due to the time-intensive process.
• Less water-resistant than chrome-tanned leather without conditioning.
• Fewer tanneries worldwide still practise traditional veg-tanning.

Chrome Tanning

Chrome tanning was developed in the late 19th century and now accounts for roughly 80–90% of global leather production. It uses chromium sulphate salts to tan the hide in a fraction of the time.

The Process

Hides are tumbled in large drums with chromium salts. The entire process can be completed in as little as 24 hours, making it far more efficient for mass production.

Characteristics of Chrome-Tanned Leather

• Soft and supple - naturally more pliable, making it popular for garments and upholstery.
• Consistent colour - easier to dye uniformly across large batches.
• More water-resistant - holds up better in wet conditions without treatment.
• Lower cost - faster production means lower prices at scale.

Drawbacks

• Does not develop a patina - the leather looks largely the same throughout its life.
• Environmental concerns - chromium is a heavy metal; improper disposal of tannery waste is a significant pollution risk.
• Shorter lifespan - chrome-tanned leather tends to degrade faster and is harder to repair.
• Not biodegradable - chromium residues persist in the environment.

Side-by-Side Comparison

	Vegetable Tanned	Chrome Tanned
Tanning time	Weeks to months	24–48 hours
Tanning agent	Plant tannins	Chromium sulphate
Feel	Firm, structured	Soft, supple
Patina	Yes — ages beautifully	No
Durability	Decades with care	Shorter lifespan
Environmental impact	Lower	Higher
Cost	Higher	Lower
Best for	Belts, wallets, structured goods	Garments, upholstery, fast fashion

Why We Choose Vegetable-Tanned Leather

At LW Leatherworking, every piece we make is crafted from full-grain, vegetable-tanned leather. We believe in making things that last - goods that improve with age rather than deteriorate, that can be repaired rather than replaced, and that leave a lighter footprint on the planet.

The patina that develops on a well-used veg-tan belt or wallet tells a story. It's a record of the life lived with it. That's something no chrome-tanned leather can replicate.

If you're investing in leather goods, invest in leather that rewards you for it.