Pasted stropping - finest abrasives
So, I've been dabbling in the dark arts of straight razor shaving. There's a surprising lack of transferable knowledge from WW sharpening. However, I've come across the following possibly interesting insights regarding the abrasives used to paste razor strops.
First, few use the Veritas green polishing compound. It is only between 30-40% chromium oxide, the rest is aluminium oxide. While it is possible to screen aluminium oxide to sub 0.5 micron grits, the molecules will clump together and behave as if the abrasive is much courser. In any case, according to the manufacturer, neither oxide was screened to eliminate particles above 10 microns (or something similar, can't remember exactly).
It is for this reason that you can actually see distinctive, fine scratches after using the compound on a chisel. If the grit were really a uniform sub one micron they would be completely invisible to the naked eye.
Not that there is anything wrong with the Veritas compound, at all. If it really were so fine, you would take forever to get a decent edge with it. WW tools do not need the same degree of sharpness as razors.
Nonetheless, for the true sharpening weirdo such as myself, pure chromium oxide is called for. An exceptionally pure and uniform example is the German-made Kremer #44200 Green pigment, available online from this website: AP Fitzpatrick Fine Art Materials Shop, Paints & Pigments, London.
A yet finer edge can be obtained with the sub 0.1 micron #48100 iron oxide, another common component of automotive polishes. There would obviously be no point doing this with a woodworking tool, however. I also can't find a supplier.
What think ye?
Pasted stropping - finest abrasives
I don't think I would bother with the 0.1 micron on the razor, let alone on a chisel.
I do think that the 0.5 micron might make an interesting progression from my 10k Naniwa.
Pointless for practical purposes, of course.
Pasted stropping - finest abrasives
I have a pot of synthetic iron oxide pigment from Schmincke that I tried for kicks as a honing compound. It was amazingly effective. I only go to 8000 on a waterstone so it may not be better than just going to the next stone... :shrug: The pot only cost me 8 euros though (11 bucks or so) and I have honing compound for two life times.
Cheers
Pasted stropping - finest abrasives
Quote:
Originally Posted by
Ben Dono
Years ago I tried out normal red cement oxide which I guessed at the time was a synthetic iron oxide. I cant say I had any luck with it but that was a long time ago and I was new to stropping... I'm going to give it another go now Berlin!
Yeah, give it a whirl. I'd be interested to know how it works for you. Just get the best brand of pigment you can, I've seen Schmincke and Sennelier here, both are very good. It's expensive paint but cheap honing grit, for sure.
Cheers