remove the patina of my Case Trapper CV

Humppa

Humppa

Joined
Jul 25, 2010
Messages
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Hi guys!

I need some help. I used my Case Trapper some time really hard. Used it for cutting apples and onions etc. Now it has a shiny-blue patina on it, when you take a different view it seems, looking in a rainbow. Not that grey patina I wanted. I own a caron-Opinel, where the patina is already black. On that knife, I like that very much.

Do you guys know some ways to remove the patina. Because I want to have the grey patina, not that ugly "blue-rainbow-shiny"-One. Perhaps you know something, that won´t damage or even destroy the nice Finish.

What I want too, is that this way of cleaning the blade has not to ordered in the US. It should be some kind of Home-Economics-Way-To-Handle. Is it able to mix up Ballistol-Weaponoil with an amount of salt and then polishing the blade? Or would that destroy the Finish? In won´t use any steelwool or anything like that...

Thank you Guys for helping an knife-nerd from the other side of the Atlanic Ocean...

Kind regards...
 
It will polish right off on a buffer.
Just be careful (safetywise & also not to overheat the blade)
Scoob :thumbup:
 
You could try darkening it by using vinegar before trying to remove it. I've gotten good results by wrapping a vinegar soaked paper towel around the blade. Just avoid getting it on the scales. Also make sure you clean it first with soapy water and dry it well to get rid of any oil that might be on it. The longer you leave it on, the darker it will get. Otherwise you should be able to remove it with a metal polish by hand. I think it was probably the onions that gave it the bluish color. Apples tend to turn it gray in my experience.

The other option is to keep using it and let it darken more over time. This requires a little more patience though. Or eating a lot of apples.:D
 
dannyp said:
You could try darkening it by using vinegar before trying to remove it. I've gotten good results by wrapping a vinegar soaked paper towel around the blade. Just avoid getting it on the scales. Also make sure you clean it first with soapy water and dry it well to get rid of any oil that might be on it. The longer you leave it on, the darker it will get. Otherwise you should be able to remove it with a metal polish by hand. I think it was probably the onions that gave it the bluish color. Apples tend to turn it gray in my experience.

The other option is to keep using it and let it darken more over time. This requires a little more patience though. Or eating a lot of apples.:D
Click to expand...
Yeah, vinegar leaves a very dark patina, but I don't know that it will be as permanent as a natural patina.

Either way, I had given my Case CV trapper a patina with potatoes, didn't really like it, and wrapped the blades in vinegar soaked bath tissue. The tissue might leave kind of a texture on the knife though, so you might have to wrap again so you kind of overlap the pattern that forms. It took the blue patina from the potatoes right off though; well, more like it covered it up.

I did 30 minutes at a time, but had to do multiple wraps to account for the texture of the paper towel making little patterns on the design. In any case, 30 minutes will leave it pretty dark; an hour will leave it almost black.

I think that's the best option for you to use, because trying to sand away the patina you have no you'll likely change the finish of the blade and it will be hard to get it as polished again.
 
Well, I bought a Chrome Polish at a hardware store. I polished it with a paper towel over the blade.
The patina was gone... I want to use the knife a lot, to get that grey patina on it...

Kind regards...
 
if you just continued to use the knife with the "rainbow" patina the knife would eventually have that gray patina. I get the shiny blue patina on all of my mirror polished carbon steel knives but continued use, especially cutting fruits and vegetables, will eventually get you that gray patina you want. The shiny blue patina is just the beginning and i think it only occurs on mirror polished carbon steel blades.
 
Brasso cleans off the patina

you cannot have a high shine and a patina!
The Bvrasso will prep the surface for your grey patina
then let it go thru colors to get to grey
 
Thanx guys!

That´s what I wanted to hear. I already used the knife a lot (had to cut a lot of vegetables and fruits for lunch). It´s already got the blue patina. Some parts of the blade are already getting black. I think that´s the other state to get the grey one...

Kind regars...

P. S. I just polished the blade to see if the patina can be removed completelly. It works, so it´s good.
 
Humppa said:
Thanx guys!

That´s what I wanted to hear. I already used the knife a lot (had to cut a lot of vegetables and fruits for lunch). It´s already got the blue patina. Some parts of the blade are already getting black. I think that´s the other state to get the grey one...

Kind regars...

P. S. I just polished the blade to see if the patina can be removed completelly. It works, so it´s good.
Click to expand...

did the patina come completely off?? like almost new condition?
 
Humppa said:
Well, I bought a Chrome Polish at a hardware store. I polished it with a paper towel over the blade.
The patina was gone... I want to use the knife a lot, to get that grey patina on it...

Kind regards...
Click to expand...

do you recall what the chrome polish was?
 
I have a question on this. Of Fitz and Simichrome which is more aggressive than the other?
 
Consider Mother's Mag Wheel polish + a Q-tip. You can get the stuff at Walmart or auto parts places. Very similar to Flitz, but at 10% of the cost. I've removed patina from CV with it.
 
Grump01 said:
I have a question on this. Of Fitz and Simichrome which is more aggressive than the other?
Click to expand...

A BF member contacted the manufacturers of both a while back, for info regarding the particle size of each. Per their replies, Flitz is ~3µ and Simichrome is ~9µ. If based only on grit size, it might be assumed Simichrome is more aggressive than Flitz. But keep in mind, the particle shape, hardness and toughness/friability also influence how aggressively they work. I've used Simichrome, and have noticed a tendency for it to start out more aggressively (removing oxide, polishing), and then become a little gentler in performance with continued scrubbing. That might indicate a tendency for it to break down somewhat (friability), as opposed to other products which might not break down as fast, and stay more aggressive. With either of these products, both will polish to a very fine degree, and both have good reputations for working effectively on removing patina (oxide). In a nutshell, I wouldn't worry either way.


David
 
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