Edward Lye wrote:
Douglas Alpenstock wrote: Ceramic works, but any sharpener using ceramics will load up with metal over time and stop cutting.
Agreed. I have a Kyocera ceramic plate about 4 inches by 3 inches.
They don't make/sell this anymore . . . like Tullen Snips. One of
my treasures.
As soon as you rub any metal across the surface, it darkens which shows
how effective it is. Diamond doesn't show that. I mostly use it to sharpen
penknives and sewing needles.
OK, here is my trick. I use a pencil rubber to clean it. It whitens up showing
that it is effective.
I collected defective computer chips before I retired. But these were stamp sized.
White, thin and fragile. I gave them away to my sisters-in-laws to sharpen
their sewing needles.