Eva Gallagher on fri 14 sep 07
Hello Mel,
I've been testing glazes with our new gas kiln and really like Rhodes 32 -
as you say on high iron. Fire to a high 10 - early 11. However it scratches
badly with metal utensils. I tried the revised version that you posted to
make it more stable with 10% more silica and a bit of rutile and it still
scratches - not good on the inside at all. Maybe you have a different clay
interaction and no scratching? Also maybe I have cheap cutlery (which I
have) and so this scratches more readily. I visited a website a few years
ago where a potter cautioned his users just to only use good quality
stainless as otherwise his dishes would get scratched.
Regards,
Eva Gallagher
Deep River, Ontario
----- Original Message -----
From: "mel jacobson"
To:
Sent: Thursday, September 13, 2007 12:15 PM
Subject: many clay bodies
>i think everyone should re/read john's hesselbreth's post on clay
> posted today,
> and print it in big font....and paste in your studio.
>
> one of the most common mistakes made in the
> world of studio ceramics is:
>
> all clay is the same. it is just clay.
>
> as john points out, over and over, and ron roy points
> out, over and over. every clay body will accept glaze
> in a new and interesting way. if you change clay...the
> glaze is no longer the same. if the company that supplies
> your clay...changes the formula...you glaze is not the same.
> often you do not even know. if the mine is moved a hundred
> yards...your clay changes. you may not know.
>
> many of you have no idea about your own clay that
> you use every day. you just buy it...use it. it may be the wrong
> clay for your work. many of you have never used a quality
> throwing clay. you do not know good from bad. you just get
> used to what you have. you may be throwing a great sculpture clay.
> and others are using a great throwing body for slab work.
>
> clay understanding is ten times more critical than glaze research.
> if folks would spend a bit of time on their clay...and find a good
> glaze that works with that clay....your life would improve 100 percent.
>
> why do folks like richard aerni, david hendley and hank murrow have great
> pots?
> it is not by accident. they know their clay, they know what
> glazes work on that clay. there is consistency.
>
> that is why i am very hesitant to have people use rhodes 32....if you
> do not have a iron content in your clay...the glaze is puke white. then
> they
> come back at me....`i hate rhodes 32, what secret did you leave out
> of the recipe?` my clay body.
> mel
>
>
>
> from: mel/minnetonka.mn.usa
> website: http://www.visi.com/~melpots/
>
> Clayart page link: http://www.visi.com/~melpots/clayart.html
>
> ______________________________________________________________________________
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>
>
Marcia Selsor on fri 14 sep 07
Eva,
Try beefing up with calcium carb..aka whiting. That helps toughen
against surface scratches.
Marcia Selsor
http://marciaselsor.com
On Sep 14, 2007, at 8:47 AM, Eva Gallagher wrote:
> Hello Mel,
> I've been testing glazes with our new gas kiln and really like
> Rhodes 32 -
> as you say on high iron. Fire to a high 10 - early 11. However it
> scratches
> badly with metal utensils. I tried the revised version that you
> posted to
> make it more stable with 10% more silica and a bit of rutile and it
> still
> scratches - not good on the inside at all. Maybe you have a
> different clay
> interaction and no scratching? Also maybe I have cheap cutlery
> (which I
> have) and so this scratches more readily. I visited a website a few
> years
> ago where a potter cautioned his users just to only use good quality
> stainless as otherwise his dishes would get scratched.
>
> Regards,
> Eva Gallagher
> Deep River, Ontario
Marcia Selsor
http://marciaselsor.com
KATHI LESUEUR on fri 14 sep 07
On Sep 14, 2007, at 9:47 AM, Eva Gallagher wrote:
> Hello Mel,
> I've been testing glazes with our new gas kiln and really like
> Rhodes 32 -
> as you say on high iron. Fire to a high 10 - early 11. However it
> scratches
> badly with metal utensils. I tried the revised version that you
> posted to
> make it more stable with 10% more silica and a bit of rutile and it
> still
> scratches - not good on the inside at all. Maybe you have a
> different clay
> interaction and no scratching? Also maybe I have cheap cutlery
> (which I
> have) and so this scratches more readily. I visited a website a few
> years
> ago where a potter cautioned his users just to only use good quality
> stainless as otherwise his dishes would get scratched.
The glaze is not scratching. The glaze is harder than the metal.
What' s happening is that you are leaving some metal from the
utensils on the glaze. Try rubbing SoftScrub on it and the marks will
probably disappear.
Kathi
>
David Hendley on fri 14 sep 07
Rhodes 32 is a classic example of a silica-deficient matt glaze,
just the sort that sends shivers up Ron Roy's spine.
There is nothing you can do to fix it - if you add enough silica
to relieve the marking problem you will lose the matt surface
and character of the glaze.
What's just as bad with some of these glazes if the awful
"fingernails on the blackboard" noise that cutlery can make
when drawn across the surface.
They will also be crazed on most claybodies - this won't be
noticeable because of the matt surface, but after months
or years of use, believe me, the glaze will be stained along
the crazing lines.
As you may be able to tell, I don't enjoy matt dishes, but
they do not bother some people and, since the Rhodes 32
doesn't contain any bad leechables, I think it is safe to
use. I have a small Rhodes 32 bowl of Mels that I enjoy
using, especially for country cream gravy, but I, myself,
would not make a whole set of plates with such a matt glaze.
David Hendley
Maydelle, Texas
david(at)farmpots(dot)com
http://www.farmpots.com
----- Original Message -----
> I've been testing glazes with our new gas kiln and really like Rhodes 32 -
> as you say on high iron. Fire to a high 10 - early 11. However it
> scratches
> badly with metal utensils. I tried the revised version that you posted to
> make it more stable with 10% more silica and a bit of rutile and it still
> scratches - not good on the inside at all. Maybe you have a different clay
> interaction and no scratching? Also maybe I have cheap cutlery (which I
> have) and so this scratches more readily. I visited a website a few years
> ago where a potter cautioned his users just to only use good quality
> stainless as otherwise his dishes would get scratched.
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