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Author Topic: Is this true?  (Read 6812 times)

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Offline Mad Dog Stafford

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Is this true?
« on: November 19, 2015, 08:43:05 AM »
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Offline sltm1

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Re: Is this true?
« Reply #1 on: November 19, 2015, 09:33:38 AM »
I believe it is.
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Offline mazo kid

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Re: Is this true?
« Reply #2 on: November 19, 2015, 11:06:39 AM »
If I remember right, obsidian scalpels are used in delicate surgical applications, like eyes, etc.

Offline jdurand

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Re: Is this true?
« Reply #3 on: November 19, 2015, 11:11:44 AM »
When I worked in a semiconductor plant (those almost retired guys who work on trains), we used probes that were chemically sharpened to where you could puncture a bacteria.  They were made from diode leads since those were cheap and easy to get.  Really bad stabbing yourself with one, you wouldn't feel it go in but the diode lead had a little Z section near the end that WOULD hurt going in and out.

The probes were for touching connections inside in IC under a powerful microscope to test bits of things.
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Offline snake-eyes

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Re: Is this true?
« Reply #4 on: November 19, 2015, 11:16:30 AM »
If I remember right, obsidian scalpels are used in delicate surgical applications, like eyes, etc.
MK,
     I read an article in one of my gun mags that pointed that out also.
snake-eyes  )&&
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Offline Kaeto

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Re: Is this true?
« Reply #5 on: November 19, 2015, 11:36:17 AM »
Just like any form of glass will do.

Offline Classanr

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Re: Is this true?
« Reply #6 on: November 19, 2015, 01:37:33 PM »
Could this be why ceramic knives are becoming popular?
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Offline Mad Dog Stafford

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Re: Is this true?
« Reply #7 on: November 19, 2015, 01:51:49 PM »
I have seen some of those ceramic knives, I never bought one.

Are they any good?
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Offline snake-eyes

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Re: Is this true?
« Reply #8 on: November 19, 2015, 01:54:33 PM »
On the subject of knives...anyone here use an ulu. I remember my mom using one in
a lot of her food prep. For that reason I got one but really never could get the hang
of using it.
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Offline Hawg

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Re: Is this true?
« Reply #9 on: November 19, 2015, 02:14:11 PM »
I've seen them used and they are good at chopping stuff but I never tried.  https://www.youtube.com/watch?v=O7Q_ovCMZFU
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Offline jdurand

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Re: Is this true?
« Reply #10 on: November 19, 2015, 02:46:16 PM »
We have two sets of the knives, one cheap white set (Harbor Freight) and one black set (bought direct from China, nice wooden handles).

The white ones are fairly sharp.

The black ones are REALLY sharp.

They can be resharpened with a fine diamond stone.

A few "do nots" to keep them sharp:
Do not EVER let anyone else use these. 
Do NOT cut on any hard surface (glass cutting boards are a stupid idea for any knife, really bad for ceramic).
Do not cut into bone.
Do not pry with them.
Do not bang the edge against a hard surface.
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Offline Sheriff Langston

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Re: Is this true?
« Reply #11 on: November 19, 2015, 04:22:01 PM »
Yes.
Freshly broken glass is one of the sharpest edges on the planet. Obsidian is a from of natural glass.
Unfortunately it doesn't stay sharp as the edge is brittle & damages almost immediately.

Ceramic knives like-ways are amazingly sharp but harder than steel to keep that way. They're also brittle & can break if dropped.

Offline DD4lifeusmc

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Re: Is this true?
« Reply #12 on: November 19, 2015, 07:46:30 PM »
yep what others already said about cautions.
brittle and can break easily.
hard to sharpen.

And yes I have read in science magazines where they are sharper than steel knives.
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