Are there notable (species-related) differences between Horse cordovan, cow cordovan, water buffalo cordovan?
Let's start the answer with the definition of 'Cordovan.' Do NOT use Wikipedia for this! It keeps calling it a 'muscle.' Muscles are not leather. Skin is leather. Muscles are the parts of meat that you eat. The term 'Cordovan' is used for two concepts; process and color. The process (where Wiki screws up,) is to first split off the very thin surface of the skin and then pound the hell out of the remaining part after it has been soaked in a water/chemical dye solution to completely saturate and color it, compressing the fibers of the leather into a very tight, dense sheet with the resulting burgundy coloring. No muscles have been injured in this process.
Next definition is 'shell.' When leather is cut, there are different areas that have different properties, and each area has a name. These areas are different between species, so cow hide has different area names and cuttings than horse hide, and both have different areas and names from pig skin, goat, lamb, etc. Here is a
chart showing the names and locations of the different cowhide cuts, and here is the chart showing the different
names and locations of the horsehide cuts. As you can see, the 'shells' are two oval areas just forward of the horse's rump. Goat, lamb, and pig skins are usually sold as whole skins rather than cuts.
"Shell Cordovan Horsehide" = Put these three terms together and you get a
'process' applied to a
'specific area' of a
'horsehide.'
I'm curious why Horse cordovan seems to be the best. Do horses have more silicates?
Good question. Horsehide has been the favorite leather for strops for the past 200 years because
it has a significantly more dense fiber structure than any other generally available leather. There are leathers that are 'stronger ' and more 'supple,' such as Kangaroo, which is why that is preferred for whip making and lacing, but it's not nearly as dense and firm as horsehide. Buffalo hide, especially water buffalo, is very dense, but tends to be lower in silicate levels than horsehide due to the natural silicates found in the grazing areas where water buffalo tend to be found. I know in the rural area where I live, farmers usually herd their buffalo along the sides of roads to eat the grass and weeds growing there. That way they don't have to pay for feed. Good enough to sustain the animals, but not particularly silicate-rich food when compared with Kentucky Blue Grass, alfalfa, clover, timothy, etc., etc. It is the very dense fiber, compacted further by the processing, that makes the 'structure' of the horsehide strop so desirable. Add in the high silicate count and you get a strop that works well as a final step in the sharpening process
without the need to add compounds on top of it.
Vegetable tanned Cowhide, 'steer hide,' buffalo hide, etc., can all be processed, effectively compressing the fibers either by the Cordovan process or at home simply with a rolling pin on dampened leather, but will not have as high a silicate count as horsehide, thus not be 'quite' as effective
without compound. They WILL produce the
same edge as horsehide, but it will take at perhaps half again as many strokes to achieve it. Horsehide isn't magical. It's just dense and has a high silicate level which makes it superior to other products for use as a strop
without compounds. Frankly, the average knife sharpener will get just as good results using less expensive cowhide, especially as most knife sharpeners want to use compounds. Covering up horsehide with compound negates much of its primary value.
I suppose silicates turn out in the cordovan muscle part as well as the skin?
Silicates are found in all parts of the body, not just the skin. And found in all animals and plants, not just horses and cows. It is the single most common element on earth.
Are horse rump fibrous muscles tighter than the equivalent on cows or buffalos?
Change 'muscles' to 'skin' and the answer is "yes." Much, much more dense than in cows. And much more dense than in the skin found in a horses' shoulder or neck.
I've noticed that newly-made (horse) shell cordovan strops are indeed quite expensive, so I was just curious about whether there were other animals who had equivalent 'cordovan muscles' from which equivalent strops could be made, and whether it would be worthwhile to do so. I mean, have you tried out water buffalo "shell cordovan" leather?
As I said before, you can't make 'shell cordovan' from buffalo leather, but you can compress the stuff and dye it burgundy color if you wish to.
I have made strops from horsehide, cowhide, buffalo hide, and kangaroo hide. All of these have been vegetable tanned hides. When being used
WITHOUT compounds, my personal experience has been that horsehide worked best, cowhide second. When used
WITH compounds, my personal experience has been that horsehide, cowhide, and buffalo hide all work equally well. As long as the hide can be made dense and firm as a substrate for compounds, the results were about equal.
Keep this in mind:
You can make a strop that will work every bit as good as one you buy, and make it for peanuts. A cowhide strop made from good quality leather from the shoulder or bend area,
properly compressed, will give an edge just as good as a strop that you pay $50 for from an on-line shop. It just won't have a fancy handle or hanging hook, or if a bench strop, have a smoothly sanded, stained and polished base. Of course, you can add these yourself if those are important to you. Gluing your processed leather to a scrap of MDF wood will work as well as hand-rubbed French Polished Birds-eye Maple. Hooks can be bought at HomePro for a buck... $10-$15 worth of
vegetable tanned leather from Tandy or Texas Knifemakers Supply, or some scrap from a local saddlemaker or leather shop, a rolling pin, block of scrap wood for a base, and some contact cement... These and a half hour's effort, and you have a strop (or three of them)
just as effective as any you can buy.
There seems to be a lack of cosmic justice there - that if one were to make a human-skin strop, a vegetarian's skin would be better suited than Hannibal Lecter's....
True... It doesn't seem fair. On the other hand, with the intensity that we knifeknuts put into our quest for the very best, I suppose the vegetarians of the world are breathing a sigh of relief that we've discovered horsehide.
Stitchawl