Robert Herder

Robert Herder

Robert Herder Windmühlenmesser - knives made the way they always were

There are very few companies in the world still making their products today exactly as they did more than a hundred years ago. Robert Herder Windmühlenmesser in Solingen is one of them. Founded in 1872 by Robert Herder, a descendant of steel temperers from the Bergisches Land, the company is now in its fourth generation and still in family hands. The knives are still ground on machines older than the people operating them. The handles are still hand-polished and shaped. And every knife still bears the mark of the windmill - the Windmühlenmesser.

The name says it all. Windmühle is German for windmill, and the windmill logo has been the company's trademark for over a century. Paul Herder, who led the company through much of the twentieth century, described the essence of his knives in a phrase that holds true to this day: "Thin, tough, nail-proved, with a razor-sharp edge - each bearing a label, only real with the red stripe."

Solingen - the city of blades

Solingen, a city in the Bergisches Land region of North Rhine-Westphalia, has been known as the knife city of Germany for centuries. Since the Middle Ages, knives, swords and scissors have been produced here; the combination of soft water from the Bergische rivers (essential for grinding), iron ore from the surrounding area and a long tradition of artisanal knowledge transfer made Solingen the European centre of the cutlery industry.

The city's reputation for quality is so strong that "Made in Solingen" is a protected designation: only products actually manufactured in Solingen may bear this name. But even within Solingen, there are significant differences. Most of the major names in the city now produce on an industrial scale. Robert Herder takes a different path: an artisanal manufactory that keeps alive the traditional grinding techniques that have virtually disappeared everywhere else.

The Solinger Dünnschliff - a dying art kept alive

At the heart of every Windmühlenmesser knife is the Solinger Dünnschliff - the Solingen thin grind. This is not a marketing term but a specific, extremely labour-intensive grinding technique that has been practised in Solingen for centuries and of which Robert Herder is one of the last custodians.

With the Dünnschliff, the blade is dry-ground on traditional grinding wheels. The grinding angle reaches much further up the blade than is standard in modern knives, so that the blade tapers progressively to an extremely thin cutting edge across its full height. The result is a blade that is not only sharp at the edge but becomes progressively thinner across its full width - a geometry that modern machine grinding can barely replicate.

Blue glazing - the most refined technique

The most demanding variant of the Dünnschliff is blue glazing (Blaupolieren). The blade surface is ground and polished in successive steps until the steel is so smooth that the microscopic grinding marks produce a subtle bluish-rainbow shimmer in the light. This is not a colour treatment but an optical effect of the extremely fine, regular surface structure.

Blue glazing was originally developed in the era before stainless steel, with the aim of polishing the carbon steel surface so densely that oxidation could barely take hold. Today, blue glazing has above all an aesthetic and artisanal value: it is the visible evidence of exceptional craftsmanship.

The knowledge of blue glazing was in danger of disappearing entirely. Robert Herder undertook years of negotiations with the Solingen Chamber of Industry and Commerce to revive the traditional grinding trades as recognised apprenticeship professions. With the help of master grinder Wilfried Fehrekampf - one of the last true masters of the traditional Solingen grinding techniques - a training programme was built that shaped young grinders well past his retirement age. His successors carry the work forward.

The steel: carbon steel with vanadium

The K-series knives are made from a European carbon steel with a carbon content of at least 1% and an addition of vanadium. This steel combines properties that are rarely found together in competing products.

Composition and properties

• Carbon: at least 1% - A high carbon content, comparable to Japanese Aogami 2 (Blue Paper #2) steel. This enables an exceptionally sharp, fine cutting edge and provides excellent edge retention.
• Vanadium - The addition of vanadium refines the grain structure of the steel, increases toughness and improves wear resistance. This is precisely the property that distinguishes Robert Herder's steel from simpler carbon steels: the combination of sharpness and toughness is rare.
• Hardness blue-glazed blades around 60 HRC - Considerably harder than average European kitchen knife carbon steel. The high hardness combined with the thin grind delivers cutting performance comparable to quality Japanese knives.
• No chromium - This is carbon steel, not stainless steel. The steel oxidises with prolonged moisture contact and develops a patina. This is inherent to the material choice, not a defect.
• Ease of sharpening: excellent - Carbon steel with vanadium responds quickly to a whetstone and takes a razor-sharp edge. Thanks to the thin geometry, only a few strokes are needed to restore the edge.

Comparison with Japanese steels

The K-series steel is regularly compared by connoisseurs to Japanese Aogami 2 - the popular Blue Paper carbon steel used in high-end Japanese knives. The parallels are striking: both have high carbon content, excellent edge retention, and develop a patina with use. The distinction lies in origin and tradition: where Aogami 2 is the foundation of Japanese grinding culture, Robert Herder's steel is the product of a century and a half of Solingen artisanal tradition.

The K-series - Solingen craftsmanship, Japanese inspiration

The K-series is the most contemporary expression of the Windmühlenmesser philosophy. The blades are inspired by Japanese double-bevel (50/50) knife design: thinner, lighter and with a sharper angle than the traditional European chef's knife. At the same time they are made entirely in Solingen using the house's own techniques.

What sets the K-series apart from virtually all other Western knives in the same price range is the geometry. The blades are ground exceptionally thin - not only at the cutting edge but across the full width of the blade. This, combined with a slight hollow grind that reduces food sticking, produces a cutting feel that many buyers associate with quality Japanese knives. The handles are ergonomically shaped and hand-polished from local woods such as plum or walnut.

Models in the K-series

• K1 - Paring and peeling knife for fine work
• K2 - Wide petty knife, versatile for smaller tasks
• K3 - Compact chef's / fillet knife
• K4 - Small chef's knife for everyday use
• K5 - Santoku format, the most versatile model
• K6 - Slicing knife for meat and fish
• KB - Bread knife with double serrated edge
• K Chef - Large chef's knife for professional use

A knife for life

Robert Herder offers a 25-year warranty on material and manufacturing defects. But the real promise goes further than that. The knives are designed and made to withstand sharpening, generation after generation. They become thinner with use and sharper with sharpening. They develop character as they are used. They are not meant to be replaced.

This is a fundamentally different starting point from the vast majority of the kitchen knife industry. In a world of disposable products and planned obsolescence, Robert Herder makes knives the way that was always the standard: good enough to last a lifetime.

Care

• ✅ Hand-wash immediately after use. Never put in the dishwasher. Carbon steel oxidises quickly with prolonged moisture contact.
• ✅ Dry immediately and thoroughly after washing, including the handle.
• ✅ Use a wooden or plastic cutting board. Stone, glass and ceramic severely damage the thin cutting edge.
• ✅ Sharpen on a fine whetstone (1000-3000 grit for maintenance, 6000+ for finishing). Due to the thin geometry, only a few strokes are needed.
• ✅ For long-term storage: apply a thin coat of neutral oil to prevent oxidation.
• ✅ Patina is normal and desirable. A grey-brown discoloured blade is a sign of use and character.
• ⚠️ Due to the thin grind: do not use on hard bones, frozen products or as a lever. The blades are exceptionally sharp but not designed for heavy chopping or lateral forces.

Specifications K-series (carbon)

• Manufacturer: Robert Herder Windmühlenmesser, Solingen, Germany
• Founded: 1872, family business (fourth generation)
• Steel: European carbon steel, at least 1% C + vanadium
• Hardness: 60 HRC
• Grinding technique: Solinger Dünnschliff, dry fine grinding, blue glazing
• Finish: Blue glaze (blue-polished)
• Grind: Double bevel (50/50), Japanese-inspired profile
• Handle: Hand-polished wood (plum or walnut depending on model)
• Warranty: 25 years on material and manufacturing defects
• Origin: Solingen, Germany