Who said that knives must have that tone metallic silver? Look what I found on the CeC store.
There are several types of knife: for cheese, bread and other. Various colors as well, including this extremely strange black.
Don't look so expensive, but logically I think unlikely that the color does not come out with the use. I hope the ink is not toxic…
The knives cost between 10 to 20 real. A good price considering the style. Cable and plastic support on the same color of the knife.
Those interested, You can search in stores CEC or so on Ebay, where I found some similar. I leave the link: