Produce & Carbon Steel

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Apr 3, 2008
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This weekend, as part of my "try something new" rotation, I pulled out an Imperial Stockman that I bought a couple of years back but have never really used.

It's made of carbon steel and was manufactured in Ireland. It has disturbingly stiff springs. Almost hazardous to your thumb knuckle. Open firmly and with care.

It's an awkward size to classify, as it's a bit larger than "medium" and a bit smaller than "large."

We'll call it "extra medium" after the fashion of the Light My Fire folks, who use that appellation for their bigger-than-regular-but-not-large sporks.

I used it for various tasks throughout Saturday, and it performed very well -- very well indeed for a seven dollar knife --requiring only a few strokes on a diamond steel in the morning, and no further attention for the rest of the day.

The blade stock is quite thin, which lends itself well to slicing tasks.

The final job of the day was to pare a couple of pounds of strawberries.

As far as the actual cutting performance, I have no complaints at all. It made the trimming and spot removal easy. I might as well have been using a razor knife.

The chemistry, on the other hand, was something else.

Almost at once I could smell the interaction of the steel with the strawberries, that familiar semi-acrid "metallic' smell.

I was unfazed by this, since I expected it. It did a fine job, and I wound up with a couple of pounds of nicely prepared strawberries, ready for snacking the following day.

I used baking soda to neutralize the acids on the blade and to remove excess blackening, cleaned up the knife and oiled it. Congratulated myself on a successful test drive and went back to rinse and bag the berries.

The berries, however, still had the metallic odor clinging to them. Most of that went away with rinsing, but not all of it.

It was at this moment that I reviewed my recent carbon steel experiences with food.

I concluded that, in this day and age, with high-performance stainless steels available which don't taint the food with a metallic taste, there really is no justification -- beyond personal curiosity -- for using carbon steel in the kitchen.

The interaction with meats isn't bad, almost unnoticeable really, but with fruits and vegetables it's pronounced and leaves a distinct taste impression on the food.


A story told to me years ago by a guy who worked with cosmetics finally made real sense. He explained that in harvesting plants -- like rose petals -- it was forbidden to bring the plant material into contact with metal. No steel wheelbarrows, no steel shovels, no metal holding bins. He related how a product expert, known in the trade as a "nose," came into a room with bins of rose petals and at once remarked, "these petals have been handled with metal; throw them out." At the time, I imagined that this was just "enhanced storytelling" and dismissed it as an anecdote used to make the point that the experts were very well attuned to their craft.

I no longer think that.

Having had the experience myself of smelling fruit that clearly had a metallic aspect to its scent validates the tale.


I do believe I will confine the applications of my carbon steel blades to outdoor work and woodcraft. It's really good for that.

Food? Not so much.

 
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Hmmm.

Finally, a topic too boring to attract any discussion.

Maybe with a different title?

Or am I just late to the party and everybody else has known this for years?

 
Okay so if we were comparing a carbon steel knife cutting up strawberries to a vehicle...carbon steel knife would be an american 80's diesel car.......blowing black smoke and stinking up the highway? Wait wrong thread sorry.........
 
In my opinion: do not neutralize the acid, let the surface to oxidize - and it will grow better in a short order. Or just use something you find more suitable! If you do not like "patina" on the blade: it is a reason enough not to use any carbon steel knives for anything. There is a whole range of stainless steels available today. I think that honest carbon steel is preferable to second-grade stainless, equal to first-grade and not as good as premium. Do not ask me how I define the grades though... :)
 
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I find similar results but unless im feeding others, I really have no preference with or without the metallic smell/taste. Of course this is coming from a welder who was constantly covered in soot and burned flux in his food
 
In my opinion: do not neutralize the acid, let the surface to oxidize - and it will grow better in a short order. Or just use something you find more suitable! If you do not like "patina" on the blade: it is a reason enough not to use any carbon steel knives for anything. There is a whole range of stainless steels available today. I think that honest carbon steel is preferable to second-grade stainless, equal to first-grade and not as good as premium. Do not ask me how I define the grades though... :)

When I'm establishing a patina, I typically either rinse the knife or use baking soda to halt the process when the blade is dark enough.

In this case the blade turned pretty much black. I used baking soda to neutralize and also to remove some of the excess black. The resulting patina is a blackish-gray with a nice sheen to it.

I'm all kinds of surprised at the quality in this knife. Seven bucks, cheap plastic scales, thin carbon steel, really stiff springs -- seriously, watch your thumb knuckle -- and a fit and finish that's worth at least ten or twelve bucks.

But the darn thing really cuts well and holds an edge.

I guess I should go pick up another couple as give-aways and toolbox knives.

 
Once you have a well-developed patina, that metallic taste will become a thing of the past. It is most pronounced with a new blade. I use carbon steel on produce regularly, and after the first time or two a blade does not impart much if any flavor to produce.
 
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