Thread: Slurry Dulling

Originally Posted by RezDog

Well in the theoretical example in my head there were a variety of things going on. First off the edge was very advanced, the second part in my head was the dulling was slight. For example if you took a 12 or 16K edge back to 8 or 10K. Something I have thought about when people are talking about honing quite high on synthetics and then finishing on a natural. As far as jnats and nagura goes I have near zero experience.

This has been my experience also, with a Coti. The edge was shave ready (sharp and smooth) and when I tried to advance the edge with a slight slurry (just experimenting) the edge degraded noticeably. Why? I assumed it was the slurry but I can't say for sure. I then went to clear water and the edge came back to shave ready. My expereince with jnats is also nill so I can't speak to that at all.

Originally Posted by Steel

This has been my experience also, with a Coti. The edge was shave ready (sharp and smooth) and when I tried to advance the edge with a slight slurry (just experimenting) the edge degraded noticeably. Why? I assumed it was the slurry but I can't say for sure. I then went to clear water and the edge came back to shave ready. My expereince with jnats is also nill so I can't speak to that at all.

+1 big time. I find I max out sharpness at a much higher level on only water. When slurry is then applied the edge dulls due to impact with the hard garnets. Not a coti expert but have had a few. If you don't believe in slurry dulling try taking a shave ready edge to a coticule with slurry. The shave is "slurry dulled" to say the least.

I can certainly see a slurry dulling an edge but all that tells me is that the slurry used is to course for its intended purpose.

Maybe particle shape & friability plays a part. Jnats are different to synths & cotis are different again.

Then again

About 6.50 mins in, this guy says slurry does the sharpening & not the stone,and he's on a synth. T or F ?

https://youtu.be/CO7KdLZY7fQ

Originally Posted by Steel

This has been my experience also, with a Coti. The edge was shave ready (sharp and smooth) and when I tried to advance the edge with a slight slurry (just experimenting) the edge degraded noticeably. Why? I assumed it was the slurry but I can't say for sure. I then went to clear water and the edge came back to shave ready. My expereince with jnats is also nill so I can't speak to that at all.

Originally Posted by S0LITARYS0LDIER

+1 big time. I find I max out sharpness at a much higher level on only water. When slurry is then applied the edge dulls due to impact with the hard garnets. Not a coti expert but have had a few. If you don't believe in slurry dulling try taking a shave ready edge to a coticule with slurry. The shave is "slurry dulled" to say the least.

Ok then why

Why do you take an edge that is slightly off the mark that needs a Re-fresh and "Start" with a light slurry, re-form (sharpen) the edge and dilute out (how far depends on your Coti) to a shave ready edge...



I have heard that theory a few times but it doesn't quite hold up..

Originally Posted by prodigy

Someone should test honing a thick slurry on a jnat for an absurd number of laps. Will the edge inifitely get more keen, plateau at a max keeness, or lose and regain keeness in a cyclical fashion?

That will happen regardless of slurry, that is a matter of Geometry and Wear

Originally Posted by onimaru55

Maybe particle shape & friability plays a part. Jnats are different to synths & cotis are different again.

I think this might be the closest to the actual truth at least IME

I actually name the slurries depending on how they are made, density, and how they are diluted

A Cutting Slurry
A Smoothing Slurry

Originally Posted by onimaru55

Maybe particle shape & friability plays a part. Jnats are different to synths & cotis are different again.

Then again

About 6.50 mins in, this guy says slurry does the sharpening & not the stone,and he's on a synth. T or F ?

https://youtu.be/CO7KdLZY7fQ

Certainly. Is your slurry an abrasive or a filler to lessen the abrasive qualities of the stone?

An abrasive slurry on top of a stone is certainly going to be more abrasive than a partially buried particle of the same grit.

I feel in this video he could simply go to a courser stone and accomplish the same thing without slurry.

Lots of good ideas so far as to what is going on


I honestly do not know for sure,, I also have a pet theory but have no proof of it


One thing I do know for sure is that messing with slurries is a ton of fun and I am pretty sure there is "Magic in the Mud"

Originally Posted by gssixgun

I think this might be the closest to the actual truth at least IME

I actually name the slurries depending on how they are made, density, and how they are diluted

A Cutting Slurry
A Smoothing Slurry

I agree but am a little slower than you!