Thread: Salm Coticule question

Recently someone posted that the brown splotches/lines/inclusions in a Salm Coti might be magnesium. Can anyone enlighten us regarding these brown spots?

I have a particular progression that includes a Salm Coticule and works very well. I am getting great edges from this progression and I would like to know what that brown stuff really consists of.

Please share any knowledge you have and thank you in advance. Inquiring minds want to know......

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Jerry

yes the black/brown spots are magnesium they are softer then the coti so they shouldn't harm the edge of your razor.

Jerry,

IIRC the black/red/purple 'splobs' and lines in Cotis were due to manganese.

Please have a peek here : The Cafeteria - Coticule Forum - home of the famous Belgian Coticule Whetstone

Have fun !

Best regards

Russ

Yeah, they are manganese from what I've read too. The one I used to have was a good one and Sham had, maybe still has one, that he thinks quite highly of. Good stones.

++1 on manganese. Manganese dioxide aka pyrolusite, found in batteries and manganese-bronze, too.

Regards,
Neil

Manganese it is.
They seem to speed up the honing.

Originally Posted by decraew

Manganese it is.
They seem to speed up the honing.

I've read that it does. Can't really say based on the one I had but it was a good one. If nothing else it looks really cool IMO.

Since we're talking about it, I'd thought I'd share one of mine. Here's a really nice Salmon or Pink Coti I picked up with that Les Lat side, It's hard to appreciate the color in pics, but it is very, very pink, even gives pink slurry, and a great cutter to boot. Just thought I'd share...Thanks Jimmy....

P.S. The 8x3 is a La Nouvelle vein, fast, great finishing stone. I put it in the pic for persepective.

Nice stone mrsell63, I wouldn't worry about the spots....

Enjoy.

Originally Posted by decraew

Manganese it is.
They seem to speed up the honing.

In general this is true, though I've had one or 2 oddball ones that were slower with these lines. But the vast majority I've played around with are faster with these spots or lines (I'm speaking with slurry use). Same goes for reddish colored/streaked coticules (these tend to be fast on water).

Manganese is common in many rocks and those black splotches are a dead give-away.