theresa sandin on sat 8 feb 03
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Hello, all!
I seem to have gotten myself into a wasting jam here. I have 2 white glazes, one older which used to be satisfactory, and one newer, which I made out of accident when I mixed too much of some other glaze (20 kgs!) So I want to save and use the second, which is the better and more expensive since it uses tin oxide.
Now I have a glaze of this proportion:
k-spar 43
kaolin 10
silica 20
zinc ox 12
whiting 15
zircopax 8
tin 2
It y=EDeld a matte, fairly uninteresting dead white on anything, especially matte and dull when thin.
Does anyone have an idea of what I can do with it (additives) to make it fun? I like shiny bright glazes, and unfortunately already have a good working glossy blue.
Anything with red iron oxide? Will it stiffen it even further? Anything with ash? I have loads of that...
Kind regards,
Theresa
_____________________________________________________________
H=E4r b=F6rjar internet!
Skaffa gratis e-mail och gratis internet p=E5 http://www.spray.se
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Ababi on sat 8 feb 03
Hello Theresa.
First the analysis:
USLESS GLAZE^6
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Cone 6 1222 deg.C. -
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Custer feldspar 39.80
EPK Kaolin 9.30
silica 18.50
zinc oxide 11.10
ultrox 7.40
Calcium Carbonate 13.90
Tin Oxide 1.85
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Seger Weight%
KNO 0.185 5.69%
CaO 0.411 8.44%
MgO 0.001 0.01%
ZnO 0.403 12.02%
Al2O3 0.300 11.20%
P2O5 0.000 0.02%
SiO2 2.600 57.19%
ZrO2 0.119 5.39%
TiO2 0.001 0.04%
K2O 0.127 4.39%
Na2O 0.058 1.31%
Al:Si 8.66
Expan. 7.13
ST 375.59
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Look in the books what react nice with zinc, defiantly blues, from cobalt =
but from
nickel too.
Try to add another five or ten zircopax and 4-7 copper oxide.
You may soften the zircopax by adding tin. Try adding 5 tin and 5 red iron=
oxide. In
general, dry the glaze and than test otherwise you don't know what you do.=
Try to wet glaze an add of iron chips from sawing or rust from raku pails =
to one wet
K'g ad a spoon or two. So can be done with brass chips from a lathe.
Perhaps well broken (very carefully made) glazes this time with CMC would =
make the
magic.
Ababi Sharon
Glaze addict
Kibbutz Shoval Israel
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910/
http://www.milkywayceramics.com/cgallery/asharon.htm
and also
http://www.israel-ceramics.org/membersGallery/personalpage.asp?MID=3D507
---------- Original Message ----------
>Hello, all!
>I seem to have gotten myself into a wasting jam here. I have 2 white glaz=
es, one
older which
>used to be satisfactory, and one newer, which I made out of accident when=
I mixed
too much of
>some other glaze (20 kgs!) So I want to save and use the second, wh
>ich is the better and more expensive since it uses tin oxide.
>Now I have a glaze of this proportion:
>k-spar 43
>kaolin 10
>silica 20
>zinc ox 12
>whiting 15
>zircopax 8
>tin 2
>It y=EDeld a matte, fairly uninteresting dead white on anything, especial=
ly matte and
dull when thin.
>Does anyone have an idea of what I can do with it (additives) to make it =
fun? I like
shiny bright
>glazes, and unfortunately already have a good working glossy blue.
>Anything with red iron oxide? Will it stiffen it even further? Anything w=
ith ash? I have
loads of
>that...
>Kind regards,
>Theresa
>_____________________________________________________________
>H=E4r b=F6rjar internet!
>Skaffa gratis e-mail och gratis internet p=E5 http://www.spray.se
>Tr=E4ffa folk fr=E5n hela Sverige p=E5 ett och samma st=E4lle - http://ch=
at.spray.se/
>_________________________________________________________________________=
_____
>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@pclin=
k.com.
Craig Martell on sat 8 feb 03
Theresa axed:
>Does anyone have an idea of what I can do with it (additives) to make it
>fun? I like shiny bright glazes,
Hi:
If it's fun you're wanting, take the day off and go to the beach. But,
there are some ways to make this glaze more active and interesting.
Dry out a quart, which will give you about 400 to 500 grams of the dry
glaze. Then you can line blend it with other glazes to find something that
you like. I would look for some very bright well fused glazes perhaps with
some soda feldspar and plenty of silica. Your glaze, as it is now, has a
lower silica/alumina ratio which accounts for some of the matte
qualities. More silica, more glass.
You can do a dry line blend by weighing out all the glazes or you can do a
volumetric line blend which is much quicker. For the volumetric blend,
weigh out about 200 grams of each glaze and mix it to the same volume. I
use a graduated cylinder to do this. Then use a syringe or anything that
will give equal measurements of the wet glaze. Start with 100% of glaze A,
then 90% glaze A to 10% glaze B, then 80/20, 70/30 etc etc, ad nauseum. Do
at least two tiles with all the glazes in a line, so to speak. On one
tile, put dots of colorants on the glazes to check color response. Use
whatever stains or oxides you wish. You might also consider doing enough
tiles for two or three firings in case of differences in maturing temps and
cooling rates.
If you just start adding stuff to the existing wet glaze you won't cover as
many bases and you will probably end up with something you like better but
you will have no idea about repeating the results. The above method will
guarantee that you know the recipes of all the glazes you mix. You may
come up with several glazes that you like.
regards, Craig Martell Hopewell, Oregon
Dai Scott on sat 8 feb 03
Theresa - why don't you take some test amounts of that "mistake" glaze, say
250 or 500 grams, and do some additions of colorants, ash, whatever, and see
what you get. To determine how much actual glaze material weight there is
in each test batch (so that you can calcualte/record what percentages of
additions you add), do the following: take a specific measure of
well-stirred glaze (i.e. cottage cheese/yogurt/whatever container); in an
identical container, fill to the same level with water; weigh each of them,
and the difference between the two weights is the amount of dry material.
Be sure to record EVERYTHING you add, with percentages, because you are NOT
going to remember what you did when it comes out of the kiln, or next week,
or next month. After firing, of course you'll want to do the
freezing-boiling test, the dishwasher test, the lemon slice test, etc., etc.
Good luck with this!
Dai in Armstrong, BC
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