(05-05-2016, 06:31 AM)BadDad Wrote: This is where I need to start doing more research, because Im just not sure what that exactly is.
I did find a guy on etsy that lives in Wales and sells slate stones that I was thinking of trying. They werent too expensive, and were a high grit progression, so I figured they might be fun to try out...
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Slate stones are tricky because there's just so many different types and vendors. They all work by the same principles - chalk embedded in quartz that cuts and polishes. I've tried a lot of them and haven't really fallen in love with slate stones in general. I have found there is a definite correlation between availability and claims that the stone is the best (when you can easily buy it, nobody seems interested, once it is gone, everybody raves about it), but then I'm a touch cynical when it comes to a lot of products.
Slate stones can get a very smooth edge, but I've found that they are some of the most inconsistent products I've ever used. The only sure-fire slate stones I've found are Thuris that are labeled (German Water Hone, Escher, etc). You can get them around 50-100 dollars if you're patient and discerning, but that's usually in some of the smaller 5"x1" sizings.
Coticules are a different sort of thing and work by polishing using garnets embedded within the stone. There are a bunch of confusing terms and veins with them, but they all work the same and generally are all capable of doing a great job honing (unlike slates.) If you go down the path of coticules I'd recommend "La Verte" vein stones, since they are fast cutters and don't really require a lot of playing around with slurries and the such.
A third option is a JNAT. It's insane how involved that can be, but for pure finishing you can get a solid stone at a decent price without worrying about all the nagura stones and such. They work differently than slates or coticules and have the highest grit capability of stones I've used. The slurry that the stones produce breaks down into finer and finer particulate during honing to give some of the sharper edges I've used.
For raw sharpest edge I've ever produced, the Gokumyo 20k is the best far and away. It is expensive, however, but extremely easy to use and consistent. Synthetic so it's really not rocket science. Use water, do 20-30 strokes, be amazed.