Thread: Funny thing happened on the way to the strop

Tony:
What kind of thin leather have you tried? I just remembered I've got some thin pigskin around that I got for lining. Would this be worth a shot? Balsa I'd have to get downtown, pigskin I've already got.




Wayne, thinking 3M spray adhesive for hold down

I seem to remember hearing about balsa being used to remove burrs from otherwise sharp knives.

Really good post!

This should start some really interesting experimentation!

Why is this working on so many of your blades? I don't know the answer but could it be that they were being dulled by incorrect stropping? I doubt that because you have been shaving with a str8 for awhile now. So, why?

No prep? Really!!! None at all??? No water, oil, nada, nothing? If so then I can only theorize that the paste used on the balsa strop was acting as a lubricant. In addition your plain leather strop may have had to much conditioning paste on it which is gumming up the edge and preventing the edge from actually cutting. Just a guess.

Abrasives on balsa wood. I have also heard of woodworker's who put there abrasive's, dry or in paste form, on hard rock maple and achieve a great edge. I have not tried that myself yet so I cannot comment on its effectiveness
I once read where the old timers would paint a flat board with green oil based paint and let it dry. Then they used that as a hard pasted strop. The green paint got its color from chrome oxide.

Hard surface,no give.... soft surface, some give.

On my pasted paddle strops i use my abrasives dry, no heavy oil, fat or wax. On my strops I tend to keep then rather dry also.

Whenever I hone I finish by washing the razor with soap and water and then "stropping" the razor on a short napped piece of cloth. This seems to remove anything stuck in the fin and also may help straighten the fin much like a plain leather strop does. In any event it does feel sharper.

I think that "stuff" on the fin degrades the shaving edge, noticably.

Just musing out loud,

Specs? mmmm, I suppose you guys may laugh a little. I went to a hobby shop and bought a thin (about 2mm thick) piece of balsa wood. The wood was about 3 feet long. I read about this on the old straight razor place about 1 year ago. I broke (literally didn't even cut them) the piece up into 3 and put .5 paste on one piece, 3 mic on another, and 6 mic on the last as a way to avoid buying 4 strops (I'm cheap sometimes). The ones with green and red paste have done well too but the .5 has really been the champ when it came to improving a edge. The balsa wood seems to have very little drag, I thought for a long time it had no effect. It turned deep black, despite the white gray paste quickly. I have reapplied paste once and let dry just last week. I assume the black was steel residue but don't know. I typically strop 20 to 40 laps check the microscope and re strop (on balsa only) if I don't see marked perfection on the blade. Usually the lower half of the blade isn't so great (I use the x pattern). I USED to go to the leather after word, maybe linen to clean the edge, and used, seemed to reapply a slight cross pattern.

Tony, I would think a strop with balsa on one side and leather on the other would be the worlds top strop right now...not sure which I would use last now though...:-)

I don't know if its important but recently the thinness of the balsa wood is allowing it to bend just like a leather strop might slightly. I think though I have been getting good shaves with it either way, for a long time and then blowing it with my leather strop.

I should clarify the no prep statement. I typically shower first and then use hot water and oil and lather, wait a little bit and then shave. 15 to 20 minutes prep, you guys are always suggesting good prep... This works great with a DE and a straight. With a DE I can shave with much less effort. Last night I just splashed on a little water and applied some lather (soap, rare for me a cream guy). Shaved immediately just to check the edge. It shaved like I've never seen a straight shave before. Almost effortless.

It could be poor stropping work on my part, that is always the case. But I think one of you guys should try this anyway. In the mean time my shave last night was so close I don't need to shave today. Last night I removed all the yellow paste I could on my strop. I may have to go out and buy a new one soon. It is a Jemico "Russian" btw. I believe my technique is correct though but have no way to confirm. I strop lightly, very lightly (and have tried all kinds of pressure over the last year or so). But now that I realize the leather is not improving the edge I can see why the lightest possible stropping is needed. I do not though know how I will maintain this edge, certainly I can't strop on .5 every day. Im going to try plain balsa for a while and try my cleaned strop on one of my razors after I shave with it. I only own 3 super sharp razors now, but with some honing I'll have a 4th for the experiments.

One likely possibility is that the strop is inpregnated with .5 paste and the balsa wood has somehow absorbed the paste and I'm getting a better stropping action on the balsa wood then I would the leather. Either way, perhaps two thumbs up for balsa wood stropping.

Tonight, I'll clean the strop again, and see if I can strop one and atleast maintain the edge. I'll use Tonys paddle strop tonight. His always seemed to perform better than the Jemico anyway.

Originally Posted by AFDavis11

Tonight, I'll clean the strop again, and see if I can strop one and atleast maintain the edge. I'll use Tonys paddle strop tonight. His always seemed to perform better than the Jemico anyway.

Try stropping on leather with the strop supported from below and see if it makes a difference.

The black ice is an optical lighting effect that looks just like a keen sharpened razor, like in the attached pic. I don't have a pic of my blade but on mine it is close to the pic with some heavy random cut lines in it at weird intervals. When I strop on leather I get thousands of added grit line marks all over the blade and it looks like a cross hatch pattern. The cross hatch is so close together that it looks like a single pattern not a cross hatch at all. Like it was stropped with steel wool. I'll start doing some more experimentation. I replicate the same angle on the microscope each time. I can manuever it to look directly into the edge and I see more cuts reflected but after I strop I see WAY more cuts. It is exactly the same edge I see when I put a DE razor under the microscope. Smooth without grit striations. Again, just like the attached pic of a keen razor, this is accomplished without stopping on leather, only on balsa.

Good experiment, very good shave. I tried to bias the experiment a little against my hypothesis (whatever that is I'm not sure, I suppose that .5 on balsa is good for stropping?). So I took 2 razors one, I'll call Razor A does not shave well, and two I'll call Razor B, shaves pretty well already. I took razor A and stropped 20 times on .5 balsa wood. It turned to black ice and looked pretty good, not quite like the pic above again with some random deep scratch marks but overall looked smooth and black. Razor B I stropped on .5 micron paste balsa as well. Both seemed to shave pretty well, about even, which was a little surprising considering the start. I then cleaned the leather strop a 4th time and stroped 30 times with the strop supported from underneath. The black ice look started to disappear as I suspected it would, but not as much as I remembered the night before. I then stropped again 30 more passes and the black ice look began to return slightly. I stropped again 30 more passes but saw no noticible change under the microscope this time. I then shaved again and I noticed a slight increase in performance from not stropping, only slight, but an increase none the less.

I then stropped on balsa wood only.......and, NO CHANGE..darn....ok.

So I went back to the strop and stropped on leather some more....went right back to where it was before stropping on balsa. Slight improvement, but not much.

So, whats going on here?

I think the .5 paste on balsa wood rocks for honing an edge.

I think I can shave without stropping with a balsa honed razor

I think there is something wrong with the strop and will need to look at a new one, I think it may be inpregnated with .5 paste. Anyone have any ideas on a deep cleaning for the strop?

Maybe I'll keep working on the strop, it appears now to no longer be ruining the edge but its not doing much to improve the edge either. Just a little improvement over .5 pasted balsa.

I'll try Tony's strop (which may be inpregnated also) and I'll try some other cleaning ideas. I think removing the paste is helping a little.

I may look for other mediums to strop on for a while also. Maybe a very soft strop material?

Originally Posted by AFDavis11

The black ice is an optical lighting effect that looks just like a keen sharpened razor, like in the attached pic. I don't have a pic of my blade but on mine it is close to the pic with some heavy random cut lines in it at weird intervals. When I strop on leather I get thousands of added grit line marks all over the blade and it looks like a cross hatch pattern. The cross hatch is so close together that it looks like a single pattern not a cross hatch at all. Like it was stropped with steel wool. I'll start doing some more experimentation. I replicate the same angle on the microscope each time. I can manuever it to look directly into the edge and I see more cuts reflected but after I strop I see WAY more cuts. It is exactly the same edge I see when I put a DE razor under the microscope. Smooth without grit striations. Again, just like the attached pic of a keen razor, this is accomplished without stopping on leather, only on balsa.

I had a response to this that didn't seem to save.

An edge can't look like black ice unless it's covered with something. The picture you showed had bad lighting. An edge cuts because of the fin ("microserrations"), which is formed where the scratch lines reach the end of the blade. In other words, without scratch lines, there's no fin. Here's a 200x microscope picture of a razor honed with a 12K stone. Notice the scratch lines?

A leather strop can't produce scratch lines if it has no paste on it. It can remove material which is covering the scratch lines. It can't dull an edge unless the strop is not taught and rounds the edge or unless something from the strop gets into the fin and gunks it up.

One thing is for sure: the strop did not produce scratch lines in an edge that didn't have them before.

DE blades have scratch lines, but they are perpendicular to the edge. They're very prominent at 60x. Try moving the light around

Originally Posted by randydance062449

I think that "stuff" on the fin degrades the shaving edge, noticably.

So, that could be another explanation for the dulling effect of the strop. Too much dressing on the surface is getting into and fouling the fin.