Tag Archives: Carbon Steel

Teeth Don’t Lie: Field Notes on a Rasp Knife named “Bull Cutter”.

There are teeth… and then there are teeth.
Serrations — and rasp.
Let’s get one thing straight.
This is not a “knife made from a rasp.”
This is a farrier rasp that refused to die.
(A farrier takes care of the feet and hooves of equines, whether donkeys, ponies or horses. He takes care of fitting and trimming the shoes.)
And when the knifemaker knows exactly what he’s doing — and here, Robin Medina Thomas from La Coutellerie de la Vallée clearly does — you end up with a blade that doesn’t just cut. It commits. Playfully.
Carrying its inheritance in both form and function.

The blade retains the unmistakable imprint of its former rasp life.
A thick spine, yet a remarkably fine cutting geometry. Along the upper section, the rasp’s triangular teeth remain smoothed — not as ornament, but as a deliberate act of preservation… a generous spine that offers a wide, comfortable track for the thumb.
These elements speak of force.
From abrasion to raw, unapologetic function.
And then, just below, everything shifts — through transformation.
In an age of excess and waste, this feels almost essential.
Not just recycling, but refinement.
A second life in excellence !

Rasp steel is high-carbon steel, typically around 1% carbon.
An old-timer alloy — simple, proven, and unforgiving if mishandled. No modern complexity.
Just steel that responds directly to heat, to grinding, to use.

And when treated right, it delivers exactly what matters:

Edge, bite, and honesty — with a potential remarkable tolerance for abuse.

That’s why this kind of steel has long been favored for expedition and field knives (TOPS, ESEE…). It has proven itself where it matters most: in wood, in weather, in real use.

Not in theory. In the field. You cant go more traditional than this.


Deep, smooth, almost liquid in its reflection, the zebu horn handle creates a striking contrast with the blade’s aggressive texture — a dialogue between softness and bite.
The transition is not only visual. It is tactile. Almost sensual.
Oh, this is a tool made with love, and a companion, still becoming.

And you feel it immediately in the balance and ergonomics.
The fingers and palm find their place naturally — no adjustment, no hesitation, no hot spots.

The spine is just right for controlled push cuts, offering both comfort and precision.
This is, above all, an excellent trimming knife.
It can also find its place in bushcraft.
Easy to bring back to a razor edge, and forgiving in use — a knife that works with you, not against you.

The profile remains restrained.
A compact geometry, balanced, with a gentle curvature that favors control over demonstration. The bevel is generous, inviting engagement without excess resistance.

Used in wood, the blade reveals its true character. It confirms the visual promise: entry is immediate, the cut remains stable, the material yields without fracture.

Under diamond stones, the edge feels stubborn—almost reluctant to yield.
But that resistance is a good thing.
As legendary knifemaker Des Horn once put it: “It’s not easy to grind carbon steel without raising the temperature too high. If it turns blue while grinding, it’s much softer.”
And that Bull Cutter’s rasp steel? It’s properly hard.

As a bonus:
Carbon steel and zebu horn share a common trait: they will change.
The steel will soon take on a patina, marking time and use.
The dark brown horn will slowly deepen, its surface already showing and gaining subtle complexity.
These are not signs of wear. These are the continuation of the object.

And Robin’s Bull Cutter is really a knife made to be enjoyed in the woods. He will see a lot of kitchen times too because the sheepfoot blade is non-threatening, almost reassuring — even to those who don’t speak the language of knives, as they are drawn to the story of a farrier’s rasp given a second life.
The guard locks the hand in place with quiet confidence, and the thin edge invites controlled push cuts with ease.

Robin made this knife for his own enjoyment — and you can feel it.
There is substance here. A certain heft in the hand, just enough to carry momentum when working light branches. It’s not meant for show — it’s meant to be used.
A compact blade with presence.
A small tank, stripped of frills and completely free of tacticool pretension.
Instead, it carries something rarer:

There is an old-timer aura….
The kind of knife that feels familiar the moment you pick it up as if that steel had already lived a looong life before reaching your hand.
It also echoes my long-standing appreciation for Schrade Old Timer fixed blades: the same kind of steel, the same pragmatic lineage.

“Excellent. Those are heat treated for hardness and not strength but are thick enough to be strong enough.” Des Horn.

And then there is the sheath. Modern. Minimal. Black. Functional.
No unnecessary flourish — just a pancake kydex shell, shaped tight to the blade, held by a simple cord system that lets you adapt carry without overthinking it.
Your knife is a tool, destined to be in your pocket, belt or bag, when you go in the woods.
This kind of sheath are indestructible and they dry easy.

The handle can be crafted from a selection of carefully chosen woods and natural materials, each bringing its own character and depth:

  • Curly Birch — light-toned and finely figured, with subtle flame patterns that shift under the light, offering both elegance and warmth.
  • Boxwood — dense and smooth, with a pale golden hue that evokes traditional European craftsmanship and understated refinement.
  • Yew — rich in contrast, blending warm amber tones with darker veins, a wood long associated with heritage and resilience.
  • Yellow Locust (Black Locust) — robust and naturally durable, with a deep, earthy coloration that speaks of strength and longevity.
  • Rosewood — dark, luxurious, and complex, with deep reddish-brown tones and a natural luster that brings a sense of quiet opulence.
  • The list goes on…

For around 100 euros (mine was 110), the Bull Cutter doesn’t belong in a display case. This is Robin’s favorite design and best seller. It belongs in the forest — in valleys of green and grey, following the rivers as they meander through the land.

It is a coup de cœur for me — and my kind of tribute to a young, gifted knifemaker.

In use. This rasp steel was born to remove matter.
It still does in a new sharp shape.

La Coutellerie de la Vallée
https://www.facebook.com/profile.php?id=61582645504772
Dampierre-en-Yvelines, France
An artisan workshop dedicated to the crafting of bespoke knives and the art of fine sharpening.
Each piece is shaped with care, guided by tradition, and made to endure in use.

📞 +33 7 61 83 52 59

52100 Paramilitary 2 by the ocean.

So here I’m in Southern Bretagne near Lorient, city of Eric Tabarly with my Paramillie Exclusive Run in 52100 Ball Bearing Steel.
For those who don’t know Sal is a fan, this is why Eric is named Eric. 🙂

The moisture and salt are present and cars got a serious tendacy to rust just by being parked outdoor.

The knife has been used on food and for all the chores around another anniversary preparations. The Patina is a real surface protector as no pit or coloration has been noticed during that 4 days week end.

It eventually has been used to pop the remaining balloons after the party.
No oil needed. The edge did not rust. It was used daily. Very happy with that knife.
This is a very robust folder, with a strong blade.
It was still shaving hairs after 4 days of mild but constant uses. I did not process a lot of cardboard for example, but a lot of meat ! Duck for the matter.

The 52100 makes a beautiful blade with its mirror convexed edge. It was noticed.

Opinel N°8 Carbone — The Crowned Hand

(You can notice the factory edge is a mess…  Easy to fix !)

I have been using Opinel since my very childhood. I was 8 years whe I was throwing my Opinel N°8 in the dirt figuring I was James Coburn in the Magnificent Seven. The blade was dull like a butter knife and black of stain but it was a constant companion.
Later when I had started to really use it I had discovered that it was really easy to get really really sharp and even to get it to razor sharp and keep it that way with just a steel sharpener. It was with an Opinel paired with a Glock knife (The Field Knife 78 (Feldmesser 78)) that I was living my first bushcraft adventures: building a shelter, making fire and cooking, making bows and arrows, sleeping in the woods…

I was buying some plants for the garden when I saw at the cashier some Opinel N°8 for 8 euros. It was the occasion to buy a new one just for the fun of using it.
I got a stainless N°10 somewhere and a filet… This Tradition Carbon is welcome.

As you can see the factory edge needs some work. But it’s so easy and fun to do.


Locked once closed.

The Jade CPM M4 Military looks like a BMW X5 compared to a Renaud 4L.
But both are fun in their own way.

Manufactured in the heart of the french Alps since 1890, Opinel N°8 hasn’t changed much. It got a new rotating ring which works also to block the blade when closed and this is a really great improvement in my own opinion.
“In the 90s, the Virobloc® system was modified to allow the blade to be locked in its closed position. ”

The con:  a round handle which not help to know in which direction the edge is. You need two hands (or your teeth and one hand) ton open the blade. Two hands to lock the blade. No clip, so the knife will disappear in the pocket. Carbon blade which can rust. But that not a problem if you know how to keep your tools oiled.

The pros: 8 euros !! This is a bargain. Half the price of Douk Douk. A very confortable rounded handle.
To quote them : “To protect our handles from external aggressions, there are two available finishes: buffing and varnishing.
Handles shaped from rare and precious tree species are buffed with wax applied with a cotton disk. For every other wood, we apply a varnish which has been selected for its highly protective properties against moisture and staining.
The varnish is tinted for the carbon range and clear for all the other ranges. To create coloured handles, we first apply a water-based wood stain before the varnish.”
The lock is reliable and easy to check.

A full flat ground blade with a thin edge. 40mm made by hand. German steel with 0.90% carbon heat treated in France at 57-59 HRC. (The Stainless version is Swedish 12C27).
“When it was first designed, the OPINEL blade was made from carbon steel. We still use a similar grade today, with an approximate carbon content of 0.90% which is still better than stainless steel. Our carbon steel is first produced in Germany and finalised in France before being worked by OPINEL.”

And this is where the Opinel is so fun to use. In all my knife it’s with my Opinels (stainless or not) that I got the best results in cutting plastic. Of course the steel won’t last like one of the new super steel but it’s so easy to go back to a very high sharpness: it’s fun.

Of course the Opinel beats all my other knives in my plastic butt/neck bottle tests. Even my great Nilakka or my reground Yojimbo 2.

The crowned hand.

Thinner and thinner !

I’ll  keep my new Opinel in my kitchen drawer. Sometime I will pocket it for going into the woods.
Compared to many modern folders, I know its performance are incredible and shows how thick the edges tend to be especially in the “tactical” scene. Strider comes to mind…
My Opinels wer beaten in wood work by the Dodo ! The Dodo got a belly which does miracle on cutting wooden rods.

I have read in a magazines some years ago that a famous hunter guide in Scotland was using an Opinel N°8 Carbone as his main hunting knife. He was using one knife by hunting season.

Anyway my good old new folder provides me “The original Opinel steel, the famous high quality cutting edge, easy to sharpen.”

Coke bottle are getting thicker at the butt, certainly a new manufacturing using more material and my new reprofile Zero Tolerance 0562CF cannot not cut through when she can still cut easily mineral water bottle’s butts.


The Opinel still can. Thin edge powaaa ! But you notice the 4mm thick plastic at the center.