Hank Murrow on sun 27 aug 00
>Diane wrote;
>looking for a jumping-off point for using granite sludge as a glaze
>component at C/6.
I've only found reference to using it at ^10. Can anybody point me in the
direction of how to use this at C/6? Hoping for a little direction.
Dear Diane; It would be helpful for you to take a look at Ian Currie's new
book, "Revealing Glazes". His Grid Method is useful, especially in
discovering what your material will do in the absence of an analysis. I
think two or three assessment tiles will bring your material into focus.
Perhaps Ruth ballou on Clayart will know of a Currie workshop near you this
sep/oct, so you could see for yourself. Lately, his focus has been in
uncovering C/5-6 glazes in response to great interest. If I were trying to
use such a material at C/6, I would almost certainly try it with Low Melt
Spodumene.
Hank in Eugene
Ron Roy on sun 27 aug 00
Hi Diane,
What would be most useful at this point is an analysis. Granites vary
widely in composition. They are more refractory than feldspars and contain
some iron. I am wondering why you would use such an impure material to
start with?
You are on the right track with 3134 and add some EPK as well.
Protect your shelves when starting a test series like this - start with 25%
frit and go up by 5% each time. Keep the EPK about half the frit. I'm just
making this up but you should learn enough from a test like this to fill in
the gaps.
Now if you can get an analysis it would be easy for me to deal with.
RR
>Hi Folks,
>I've taken a lengthy stroll through the archives looking for a
>jumping-off point for using granite sludge as a glaze component at ^6
>temps. Unfortunately, I've only found reference to using it at ^10 or
>so. Can anybody point me in the direction of how to use this at ^6? If
>I combine it with a frit like 3134, is that going in the right
>direction? I'm truly a rank beginner when it comes to this type of
>experimentation and I know, "test, test, test." Hoping for a little
>direction, though!
>Thanks!
>Diane, enjoying August now that it has finally reached the Connecticut
>shoreline!
Ron Roy
93 Pegasus Trail
Scarborough
Ontario, Canada
M1G 3N8
Evenings 416-439-2621
Fax 416-438-7849
Diane G. Echlin on sun 27 aug 00
Hi Folks,
I've taken a lengthy stroll through the archives looking for a
jumping-off point for using granite sludge as a glaze component at ^6
temps. Unfortunately, I've only found reference to using it at ^10 or
so. Can anybody point me in the direction of how to use this at ^6? If
I combine it with a frit like 3134, is that going in the right
direction? I'm truly a rank beginner when it comes to this type of
experimentation and I know, "test, test, test." Hoping for a little
direction, though!
Thanks!
Diane, enjoying August now that it has finally reached the Connecticut
shoreline!
Jim Bozeman on mon 28 aug 00
Hey Diane, I use granite powder as one of my glaze ingredients and I fire to
cone 10. I can send you some dried granite powder if you like. Here's what I
would do if I were you; do a tri-axial blend of granite powder, feldspar and
a low fire frit. I use 24% granite powder in my own glaze (which is cone
10). If you send me your address I will send you the REAL way to do a
tri-axial blend chart where you have all three ingredients in every test,
including the corners! Most books teach the way where in the corners there
is 100% of ingredient A and NONE of ingredients B and C. Paul Soldner
pointed me in the right direction at a workshop years ago and I have been
grateful for his insight ever since! Let me know if you need some granite
powder as I possess a lifetime's supply. BTW, I'm making some jugs for a
lady in Connecticut that is making hard cider. She couldn't find any
potter's in your area that would make jugs. Maybe it's a Southern thing?!
Jim in Athens, GA where Fall is hopefully around the corner.
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Martin Howard on mon 28 aug 00
I use granite dust at cone 1 and 2.
I refer to the dust which comes from the diamond saws of monumental masons.
I have the analysis of it if required, but that refers to one monumental
mason yard in GB. It forms a good finish with Borax Frit at 60/40.
Do a simple line test of your cone 6 frit with your granite and see which
percentage works best for you.
Then have it analysed and put the details in the computer program to see
what other additions you need for the basic glaze. After that just add
colouring oxides, again in line tests. That way you can build up a very good
stock of personal glazes which work in YOUR conditions. I now use it as 10%
of all my glazes, because I need some other qualities, such as P2O5,
bentonite, extra silica etc
Martin Howard
Webb's Cottage Pottery
Woolpits Road, Great Saling
BRAINTREE, Essex CM7 5DZ
England
martin@webbscottage.co.uk
Diane G. Echlin on mon 28 aug 00
Thank you Ron!
I'm printing out your post and taking it to the studio to work off of. As for why
use an unknown material/no analysis, I guess I am simply intrigued with using some
"found" or "local" material. (I know, I know, we had that discussion a couple
months ago about the virtues of local/found materials) Perhaps I'm a little less
threatened by the prospect of "failure" because I am using something unknown, and
can attribute failure to that. Dunno. I guess the short answer is Why Not?
Thanks again for the starting point,
Diane in CT
Ron Roy wrote:
> Hi Diane,
>
> What would be most useful at this point is an analysis. Granites vary
> widely in composition. They are more refractory than feldspars and contain
> some iron. I am wondering why you would use such an impure material to
> start with?
>
> You are on the right track with 3134 and add some EPK as well.
>
> Protect your shelves when starting a test series like this - start with 25%
> frit and go up by 5% each time. Keep the EPK about half the frit. I'm just
> making this up but you should learn enough from a test like this to fill in
> the gaps.
>
> Now if you can get an analysis it would be easy for me to deal with.
>
> RR
>
> >Hi Folks,
> >I've taken a lengthy stroll through the archives looking for a
> >jumping-off point for using granite sludge as a glaze component at ^6
> >temps. Unfortunately, I've only found reference to using it at ^10 or
> >so. Can anybody point me in the direction of how to use this at ^6? If
> >I combine it with a frit like 3134, is that going in the right
> >direction? I'm truly a rank beginner when it comes to this type of
> >experimentation and I know, "test, test, test." Hoping for a little
> >direction, though!
> >Thanks!
> >Diane, enjoying August now that it has finally reached the Connecticut
> >shoreline!
>
> Ron Roy
> 93 Pegasus Trail
> Scarborough
> Ontario, Canada
> M1G 3N8
> Evenings 416-439-2621
> Fax 416-438-7849
>
> ______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
Diane G. Echlin on mon 28 aug 00
Thanks for the info, Martin.
As yet, no glaze program, but I'm weakening....as i grow more and more interested
in the whole glaze chemistry thing, I want to master the process, not be slave to
it. Someday.....!
Diane
Martin Howard wrote:
> I use granite dust at cone 1 and 2.
> I refer to the dust which comes from the diamond saws of monumental masons.
> I have the analysis of it if required, but that refers to one monumental
> mason yard in GB. It forms a good finish with Borax Frit at 60/40.
> Do a simple line test of your cone 6 frit with your granite and see which
> percentage works best for you.
> Then have it analysed and put the details in the computer program to see
> what other additions you need for the basic glaze. After that just add
> colouring oxides, again in line tests. That way you can build up a very good
> stock of personal glazes which work in YOUR conditions. I now use it as 10%
> of all my glazes, because I need some other qualities, such as P2O5,
> bentonite, extra silica etc
>
> Martin Howard
> Webb's Cottage Pottery
> Woolpits Road, Great Saling
> BRAINTREE, Essex CM7 5DZ
> England
> martin@webbscottage.co.uk
>
> ______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
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