2. Grindstone / whetstones
Traditional grindstones are abrasive stones, often made of materials like natural stone, ceramic, or diamond, used to sharpen and refine blades manually. They provide precise and customizable sharpening results, making them suitable for a wide range of knives and tools. Users can control the sharpening angle and intensity for optimal results.
This method requires skill and practice, is time-consuming, and wears down stones over time. Aggressive grinding may remove too much metal, shortening the blade's lifespan. It can be hard to maintain a consistent angle on both sides, and balancing the edge can be challenging.