Case CV and Patina

Joined
Dec 22, 2007
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990
Hi all,

These last couple weeks have seen my collection of carbon bladed knives increase from one lonely GEC Barlow to a flock of five slippies. Having been traveling extensively for the last month or so has afforded me to the opportunity to visit several platinum and two Master level dealers in Georgia, Tennessee, and Florida. You just don't get that in my home state of California (especially SoCal, where there's only one platinum dealer, and a mess of silver level ones). In fact, I'm looking forward to my trip to the Dallas area in a couple weeks to poke around as well.

The GEC is still alone, as my new acquisitions are all Case knives of various shapes, sizes, and handle materials. I picked up a yellow Peanut, an Amber medium stockman with a spear blade instead of a spey (I really like this configuration), a Chestnut SBJ with off-center blades that doesn't seem to leave my pocket, and a yellow, full-size Trapper. I apologize for the lack of pictures, but only the SBJ and Trapper are with me, and I don't have a USB cable with me anyhoo :)

I guess I should get to the point of my post before I scare away too many people with my wall o' text. I've started the "patina process" with one of my favorite pieces of fruit, the might Fuji Apple. Maybe it's my imagination, but the CV in my Trapper (the only one I've really used on fruit, so far) seems to stain slower than the 1095 did in my Barlow. I've peeled and sliced three apples over the course of the last day. I've even let the juice sit on the clip point until it dried, and it still seems kind of light. It's not that I'm impatient; quite the opposite in fact. I'm perfectly content to let the patina develop over time. I was just curious if it was the metallurgical make-up of the two steels that caused the difference in the patina-ing. Does anyone have any insight or observations of their own to share?

Thanks in advance, and I'll try and get some photos up of "flock of five" as soon as possible. Of course, this may turn into a group of six or more before I get a chance to photograph my knives.

Best,

Keith
 
I've noticed the same thing - 1095 blades on Camillus & Schrade knives seems to get darker faster than CV. I bet some of the guys on this forum who really know steel can tell us why.....
 
I got a real good patina on my GEC by just cutting up a Mango. CV as used by case includes several other alloying elements including chromium. Not enough to make it a stainless but enough that it does inhibit staining somewhat.
 
This is about a year of daily use with no "cheating."

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Interesting to know, and thank you for the replies. I figured it had something to do with CVs make up vs. other carbon steels. I'm pleased with my new pocket jewelry and look forward to having the blades darken. Thanks a ton!
 
It seems to me that the more polished a blade is the longer it takes to patina regardless of the type of carbon steel. I've already got a great patina going on my #8 Opinel, but my GEC is taking it's time.
 
Interesting. My GEC took a really dark one after only a couple apples and an orange. It's not black by any means, but it's getting nice and gray.
 
I've found that certain kinds of meat juices put on a great bluish patina. My yeller handle CV peanut has gutted and cleaned some panfish, and it gave an irridesant blue patina. Goes well with the yeller handles.
 
Case CV steel used to turn almost black immediately when used on fruits and veggies.The Case CV in use today seems much more stain resistant.Maybe a little more chrome in the formula?
 
here are my yeller CV, all have seen food/kitchen duty and the Medium stockman and Soddie have seen the most pocket time and the most granny smith apples:D
cheers
ivan
patina.jpg
 
Not a Case, but I got a really good start on a patina on my Bulldog sodbuster by slicing up just one pineapple. Highly recommended!
 
I've noticed the same thing - 1095 blades on Camillus & Schrade knives seems to get darker faster than CV. I bet some of the guys on this forum who really know steel can tell us why.....

Camillus 0170-6C steel (which Cold Steel sold as Carbon V) is a low alloy steel containing small amounts of Chromium and Vanadium. It is similar to Case CV as to the amounts of Vanadium and Chromium. (I know that 0170-6C contained 0.95% Carbon. It has been posted here that the current Case CV contains 0.85% Carbon.)

Camillus also made blades of straight 1095 Carbon Steel.

I have several Camillus knives with 0170-6C steel and I have several Camillus with 1095. I also have Case CV and Schrade 1095 blades.

All of my 1095 blades darken faster than my 0170-6C or Case CV blades. None have seen fruit or other acidic media.

My guess is that the finer grain structure developed by the alloy steel resists rust a tad better than the coarser structure of the Carbon Steel. But I am only guessing.
 
Thanks, Knarfeng! You were one of the folks I had in mind when I referred to 'guys who know steel'. What a wealth of knowledge this forum has proven to be!
 
I'm still learning. But, thanks.
 
I started to let patina form on a 70's dot Case small stockman, and after a day, I had to pull out the Flitz and put a shine back on the blade. :o Sorry guys, I really tried to let patina form, really I did. I guess I like em shiny!
 
I just got a chestnut stockman in CV
The clip has gone dark very soon.
I use it alot on vegetables and fruits

My Bokers color quicker, almost immediately.
They go blue first!
 
Get a case of Corona and a couple limes. By the time you finish cutting those limes up CV steel gets a nice patina. Trust me, I have done this with many of my slippies.:D
 
Make sure you get the blades very clean before using on fruits. The oils on the blades will protect it from the juices. My CV's usually patina quicker than my 1095 blades, but I make sure they are very clean.
 
I get the best results darkening 1095 blades by slicing up gilled meats. Something about the hot briny juices that really brings out a nice dark patina. We held a birthday party for a friend earlier in the year and had about 30 folks over. I grilled a ton of sausage, chicken and ribs and slicing it all that night left the main 1095 blade of my Queen canoe a really dark grey. Love a good patina!
 
My CV knives responded very quickly to grilled meats as well. The steel in German Eye seems to be the most resistant to patina but I have no idea what the alloy is.
 
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