Can a ceramic knife sharpener sharpen a stainless steel blade?
Ceramic in the description of a knife sharpener refers to the material the knife sharpener is made from, not the type of material it sharpens. A ceramic knife sharpener is made out of a ceramic material and can be used to sharpen most knives, including stainless steela diamond knife sharpener is made with diamonds, and can be used to sharpen even the harder metals, such as carbide. Ceramic sharpeners are often used for kitchen and hunting knives, and is a good choice for most stainless steel knives. I happen to have a collection of sharpening materials, including stones, files, ceramics and diamondand then there's always the assortment of sandpaper (various grits) used with a piece of glass as the work surface under it. Have Fun
According to this website, there are no materials that can block a magnetic field.
Yes, that's what it's made for.
I assume you mean a knife sharpener that is ceramic. There are knives with ceramic blades, but ceramic blades can't (practically speaking) be sharpened. You can sharpen a stainless steel blade on a ceramic sharpener, but some types of stainless steel won't take or hold a good sharp edge (no matter what kind of sharpener is used). Other types of stainless steel sharpen quite well.
Only superconductors will expel a magnetic field. You won't find any of them around your house, I'm afraid!
