Ceramic Knives Keep Apples Fresh?


I was talking to a chef friend of mine who also uses a few Kyocera ceramic kitchen knives. I asked him what he really likes about it. Aside from its sharpness, he also mentioned that his fruits don’t oxidize and turn brown as fast when he uses his ceramic knife to cut it, particularly apples. I knew ceramic knives are chemically inert, and that they’re not supposed to react with your food, but I thought it was in regards to taste, not color!

You probably guessed what I did next. I headed straight to the supermarket and picked up some apples to test this theory. I was really skeptical about the whole thing. But then again, the advice was from a professional chef who uses ceramic knives daily. He wasn’t trying to sell me any knives, he was just being a pal and sharing his knowledge.

I started by cutting one with a $150, newly sharpened Henkels knife and the other with my Kyocera ceramic knife. I let them sit, taking pictures in random intervals. The results made me say “Oh my gosh!” The apple cut with the regular kitchen knife did indeed turn brown a lot faster than the one I cut with the ceramic knife! See the images below and click on them to enlarge.

After about 15 minutes, the apple wedge cut with the ceramic knife hardly oxidized at all, while the slice cut with the kitchen knife already showed some signs of discoloration. After about an hour and 10 minutes into the test, the differences became very apparent as you can see from the pictures.

I left the apple wedges out even after I was done with the test. The next morning, I was even more surprised at what I saw. The slice cut with the ceramic knife remained in the same condition it was the night before! There was no further discoloration or oxidation. I was amazed!

To be honest, I didn’t think this would really work, but as you can see from the images, it truly does! Now I can feel confident about cutting fruits ahead of time without having to worry about oxidation. Through the couple of weeks I’ve used a ceramic knife, this test really amazed me more than any others. Moving forward with my test, I don’t think anything will amaze me more than this.

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