Originally Posted by
Christian Setla
Gents,
Please remember, coticule hones have been used for a long time, high carbon steel has also been used for a long time and the two work very well together. Modern PM11 or A2 and the like, will not work well with a coticule. Why, you ask? The coticule contains garnets as the abrasive element. Today, garnets are used in the cheapest sandpaper you can buy.... because they don't last. Garnets, with their wonderful dodecahedron shape, do wonders smoothing a high carbon steel (think vintage Sheffield straight razors from the 1800s), but are sadly lacking when it comes to todays modern hard tool steels.
Slurry vs non slurry. Raising a slurry allows a coticule stone to cut faster (in fact, you are lapping, not grinding, as the garnets have been released from the hones surface). Garnets still fixed in the surface will tend to burnish more than cut, which is what modern fractured (like a glass shards) abrasives, fixed in a binder, hones do. This is the reason many find that a coticule does not perform well after flattening the hone with a diamond plate... The diamonds will fracture the garnet crystals and thus prevent the burnishing effect that straight razor shavers know as the "smooth edge" of a coticule honed razor.
As wood doesn't give a flying fig about smoothness (unlike my face whilst shaving with a straight razor), I will resort to a modern hone using modern abrasives for all tool steels, be it high carbon (old school) or the new steels.
Coticules vary in softness and amount of garnets AND size of said garnets. Some hones will "auto slurry" by simply attempting to hone a blade... others are rock hard and resist such slurry activity, requiring the use of a slurry stone (a piece of coticule... NOT a diamond hone that would fracture the garnets). 15 years ago, nothing was said about what "vein" a hone came from... then the elitists (my opinion) began making a big deal of which vein a hone came from. My opinion, spend some time with the hone.... if it just doesn't work for you, flog it off to someone else... but don't be surprised if they claim it's the greatest hone ever! They just "figured" the hone out, and you could have too if you gave it a chance.
In woodworking, it seems to me that getting on with the woodworking is more important that honing tools.... When it comes to shaving my face... I'll spend some extra time on the edge to make sure it's smooth and comfortable while shaving.
Bottom line, I'll reach for the Shapton or Naniwa synthetic hones (16K and 12K, but due to the manufactures fudging, I find them equivalent), and for my Shefield made straight razors from the 19th century, I'll go for either the Coticule or my Zulu Grey as a finisher, but the preliminary honing is still done on synthetic hones from (in my case) Naniwa.
Regards
Christian aka
Kaptain "I used to have HAD (hone acquisition disorder, but now I don't) Zero