Carrots Cause Discoloration on CQC-7BW Coating

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Jan 6, 2007
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Yesterday, I washed two carrots with water and then went on to peel them with my coated(black) CQC-7BW (year of manufacture 2009).


The oddest thing happened. As soon as I finished peeling the carrots I noticed discoloration on the black coating of the blade. The discoloration was greenish with a metal tint. It shows on both sides of the blade and is patterned as if wiped on there with a rag or something.

Obviously it's from peeling the carrots as it appeared instantly after the peeling. The discoloration is visible in most lighting conditions but not very strong at all.

I washed the blade with hot water and wiped it dry after peeling, perhaps 3 minutes later and the discoloration remained. Maybe I'll try a rough sponge later and some soap. But maybe it's permanent. Oh the horror :p


Sooo....Is this someone else has experienced with CQC series coating, with other veggies/fruits? Anyone know what exactly caused this?
I've never seen carrot acids cause this kind of discoloration. It seems the acids reacted with the coating.



FAQ:
Yes, Im certain my knife is from Emerson.
No, the edge didn't chip or deform from peeling.
No, it is not dull after peeling 2 carrots.
No, the carrots were not nuclear/uranium treated.
Yes, They tasted fine.
Yes, Im still alive and feeling fine.
No, I have not developed a need to eat human brain. Yet :eek: :D
 
This happened to one of my P-tacs from cutting limes. The whole blade was covered in lime juice but only the part of the blade you can see showed any staining. I don't know if it's because of the coating application method, the way the blade was preped before coating or something but it seems odd only part of coating showed any staining.

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I got a similar stain from chopping though a thinnish branch in the garden. I think it was a fuschia, new season growth, easy to slice through but left a stain I can't move. Doesn't bother me though, adds character :)
 
I've noticed colour changes on my coating as well but tried a little bit of
never-dull on it and it vanished.
 
slicing up carrots with a carbon steel knife is a GREAT way to add a mottled patina to the steel. Same with soaking the steel overnight in carrot juice.
 
My coated Emerson's get some light stains from veggies. So do some other coated blades too. Normally it comes off with a dab of metal glow or similar on a paper towel and light rubbing. I've had some uncoated blades develop a nice patina just from normal kitchen use, one of my custom CQC-8's turned a muddy grey after a couple hours kitchen duty. But again, some metal glow and alot of polishing/rubbing brought it back.
 
You guys are really going to have to stop posting pic's of those Persians!
Damn nice knife! I could really see myself carrying around one of those
regularely. Great in the kitchen I'll bet.
 
You guys are really going to have to stop posting pic's of those Persians!
Damn nice knife! I could really see myself carrying around one of those
regularely. Great in the kitchen I'll bet.

I had one briefly but decided to give it to my father for his birthday. I miss it dearly and am thinking of buying another.
 
Glad I'm a carnivore.
My Persian still looks good after carving up quite a few steaks.
I think our preferences are similar.
Gotta go, getting hungry.

CP
 
I've had mine into everything from meat to limes to apples & oranges. It's an older Benchmade/Emerson CQC-7B w/ the regular tanto blade, and it's somewhat discolored all over. Never gave any thought to it, as it's a knife I have to carry and use.

Scratch it up a little and you'll never notice the discoloration.
 
I know exactly how you feel :D ...but sometimes between fighting the bad guys and surviving the zombie hordes you just need to stop for a moment and get your energy levels back up :eek:


Ha ha.... gotta love all these veggies getting sliced up by $200 tactical folders. :D
 
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