Thread: Switching Slurries on Coti's/BBW's

interesting idea mixing slurries, I have not tried it. Although, it might just be a stroke saving excersise if you end up doing strokes with just water.

On the stones I do not have a slurry stone for, I use a small sanding block - seems to do the job.

Actually, I have horsed around with this a little bit.

I think using a belgian blue slurry on a coti makes it a bit slower and "softer",

And using a coticule slurry on a blue speeds it up a bit.

I think there's more to the BBW's than the garnets really.

Here's a quote from Rob at Ardennes Coticule:
"Coticule stones have always more garnets than a BBW stone and the garnets of a Coticule are always smaller than those of the BBW.
Smaller garnets <-> more garnets --> higher grit
Larger garnets <-> less garnets --> lower grit"

When I bought my first natural coticule from Howard, I also bought a slurry stone. The slurry stone is coticule, with a slate backing.

When I use the coticule slurry stone on the coticule side, I get milky white coticule slurry. When I use the same coticule slurry stone on the blue side, I get blue (purple?) slurry. Can't explain this, but it's what I see. And the blue slurry definitely feels and cuts different, even when raised by the coticule.

I've never tried building a coticule slurry on the coticule side, and then transferring it to the blue side. I like what each type of slurry does when matched to it's side. But I have tried dripping coticule slurry onto a DMT8000, without any effect I could see. The DMT felt a little different, but didn't really cut any more "gently". Diamonds are just harder than garnets, maybe?

I was thinking about that drawing Bart posted some time back- the large bbw garnets cutting wide shallow grooves- i guess he was saying it smoothed out the edge- maybe a cool combination to mix and match scratches with a coti ; but then if you use it(bbw) as a slurry on the coticule; isn't then just adding to the slurry-dulling effect ?

Originally Posted by kevint

I was thinking about that drawing Bart posted some time back- the large bbw garnets cutting wide shallow grooves- i guess he was saying it smoothed out the edge- maybe a cool combination to mix and match scratches with a coti ; but then if you use it(bbw) as a slurry on the coticule; isn't then just adding to the slurry-dulling effect ?

Probably, but what if you use a Coticule slurry on a BBW? Wouldn't it kick it up a notch? Like a nice step in between BBW and Coticule? I'm not sure, but I've done it and got good results.

let me throw into the mix with my slurry use

I had no nagura (cotigura?) anyway, I had no slurry stone, so I was using a piece of broken Shumate razor hone.

It was red and made from aluminum oxide and turned all the slurry pink.

I've used coti slurry on an Arkansas (faster, finer cutting under scope)
escher slurry on a swaty (no real difference in scratches under scope)
BBW slurry on an Arkansas (no real difference in scratches under scope)

never mind......lol