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Ceramic Knives: 5 Fast Facts

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Fact #1. Regarded as humankind's first tool, knives were used by ancient hominids at least 2.5 million years ago. Because of their status as the earliest human tool, they were assigned spiritual significance by some cultures who hold them in reverence. Originally made primarily of stone and bone, they've evolved from there to eventually come from various metals, including bronze, steel, iron, and ceramic.
Fact #2. Knives didn't make their way to the dinner table until the French Bourbon Dynasty of the 16th century. Prior to that, they were used almost exclusively in combat, for cutting and shaping other items, and in butchering and preparing meat. It's said that they were kept away from the dinner table because at the time they were exceptionally sharp. This made them dangerous for anyone who had consumed too many drinks.
Fact #3. Ceramic knives are actually significantly harder than their steel counterparts. This is because they're most often made from zirconia, which is a crystalline oxide. It's rated at an 8.5 on the scale of mineral hardness. For comparison, diamond is rated 10 on the scale. Normal steel is rated 4.5, and hardened steel at 8.
Fact #4. Ceramic knife users won't need to sharpen their knives frequently. When they do, a professional sharpener may be required. These knives, unlike steel models, do not benefit from regular sharpening. In fact, attempting to regularly sharpen one can actually shorten its life and cause damage.
Fact #5. Ceramic knives have some drawbacks. Chief among them is brittleness. While they're remarkably hard, if they are dropped or bent, they have been known to shatter. This is because they're so hard they actually refuse to bend when put under stress. Where a steel knife would flex and warp, these knives will break.
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Hardware
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