Monica Wright on sat 29 oct 11
I can't remember how to remedy this problem.=3DA0 I have a glaze that i wan=
t =3D
to continue to use -lowfire white.=3DA0 When applied in any way (dip, pour,=
s=3D
pray, etc.) it dries in a way that when i touch it the glaze just comes off=
=3D
onto my hands as powder.=3DA0 What do i add to my liquid glaze to harden t=
he=3D
surface when it dries but does not change the glaze characteristics when f=
=3D
ired?=3DA0 I have heard of people adding corn syrup but that kinda promotes=
m=3D
old growth if left to sit for a while.=3DA0 Any thoughts?=3DA0 Thanks.
William & Susan Schran User on sat 29 oct 11
On 10/29/11 12:17 PM, "Monica Wright" wrote:
> I can't remember how to remedy this problem.=3DA0 I have a glaze that i w=
ant =3D
to
> continue to use -lowfire white.=3DA0 When applied in any way (dip, pour, =
spra=3D
y,
> etc.) it dries in a way that when i touch it the glaze just comes off ont=
=3D
o my
> hands as powder.=3DA0 What do i add to my liquid glaze to harden the surf=
ace =3D
when
> it dries but does not change the glaze characteristics when fired?=3DA0 I=
hav=3D
e
> heard of people adding corn syrup but that kinda promotes mold growth if =
=3D
left
> to sit for a while.=3DA0 Any thoughts?=3DA0 Thanks.
Adding a gum binder will help with the dry powdery surface.
I'd suggest CMC.
Mix 25 grams dry powder CMC with quart water.
Let sit a couple days to wet the CMC powder or put in blender.
Little of this CMC solution added to glaze will do it.
Don't need much.
CMC is also organic so stored a long time may mold.
Bill
--=3D20
William "Bill" Schran
wschran@cox.net
wschran@nvcc.edu
http://www.creativecreekartisans.com
Ron Roy on sat 29 oct 11
Hi Monica,
The best way is to sub in ball clay for the kaolin - do it with =3D20
calculation and keep the SiO2 and Al2O3 the same.
I can't do it for you now but I will when I get back in a couple of =3D20
weeks - just send me the recipe and the kinds of ball clay you can get.
RR
Quoting Monica Wright :
> I can't remember how to remedy this problem.=3DA0 I have a glaze that i =
=3D20
> want to continue to use -lowfire white.=3DA0 When applied in any way =3D2=
0
> (dip, pour, spray, etc.) it dries in a way that when i touch it the =3D20
> glaze just comes off onto my hands as powder.=3DA0 What do i add to my =
=3D20
> liquid glaze to harden the surface when it dries but does not change =3D2=
0
> the glaze characteristics when fired?=3DA0 I have heard of people adding =
=3D20
> corn syrup but that kinda promotes mold growth if left to sit for a =3D20
> while.=3DA0 Any thoughts?=3DA0 Thanks.
>
David Woof on sun 30 oct 11
Hi Monica=3D2C
put 15 grams of CMC into a pint of hot water. Mix well in blender or Oster=
=3D
type mixer.
add this to a gallon of H2O and use 100% in mixing your dry power materials=
=3D
recipe.
To add to an already liquid glaze=3D3B use 45 grams CMC to a quart H2O and =
ad=3D
d a=3D20
generous cup full per 1000 grams of liquid glaze. This will stop your powde=
=3D
r=3D20
problem and not effect the fired result.
When spraying a glaze=3D2C the fragile droplet matrix is easily disturbed b=
y =3D
handling=3D20
(leaving thumb and finger print smudges in the fired glaze) even when using=
=3D
CMC in the glaze
mix.=3D20
I spray over the sprayed glaze surface with the stronger CMC solution=3D3B =
be=3D
ing careful not to=3D20
saturate until it runs because this will also leave tracks in the fired gla=
=3D
ze.=3D20
When the over sprayed CMC dries and hardens one may then carefully handle t=
=3D
he sprayed work=3D20
for transport to the kiln and loading.=3D20
Some folks use hair spray=3D2C but in my opinion based on experience the CM=
C =3D
gum is a better=3D20
application for several reasons.
CMC also serves to help keep the glaze materials in suspension.
Recent example::: =3D20
When i heard that an institution of higher learning was charging folks $150=
=3D
0.00 US per head=3D20
to attend a workshop out at Don's=3D3B it irked me=3D2C so I've invited the=
Yav=3D
apai=3D20
College ceramics students and interested area potters to a free wood fire w=
=3D
orkshop=3D20
this coming weekend.
In prepping glazes in the guest glazing room for the workshop=3D2C I found =
tw=3D
o 2 gallon buckets=3D20
of "Cee Clear" and "Blue Flambe" someone had left behind from last firing.
(anyone know these glazes?) =3D20
Both had settled to hard cake in the buckets so I dumped about 50 grams of =
=3D
"Glass Magic"=3D20
in each=3D2C agitated a shake or two and left them to sit a few minutes whi=
le=3D
the Glass Magic=3D20
worked its magic.
A bit of mixing and the hard cake was dissolved.=3D20
Then I added something near 3% bentonite=3D2C a good shot of the strong CMC=
s=3D
olution=3D20
and stirred well.
Three days later the glazes are still in suspension=3D2C no appreciable set=
tl=3D
ing=3D2C =3D20
and a quick stir will have them ready to go when/if someone wants to use th=
=3D
em next Wednesday.
Who has time or excuse for standing around grunting away at glaze buckets w=
=3D
ith caked bottoms=3D20
each time they go to glaze pots when we have such ready means at our dispos=
=3D
al to=3D20
have otherwise?
David Woof.....Clarkdale=3D2C Arizona
______________________________________________________________
Date: Sat=3D2C 29 Oct 2011 09:17:52 -0700
From: Monica Wright
Subject: powdery glaze surface
=3D20
I can't remember how to remedy this problem.=3D3DA0 I have a glaze that i w=
an=3D
t =3D3D
to continue to use -lowfire white.=3D3DA0 When applied in any way (dip=3D2C=
pou=3D
r=3D2C s=3D3D
pray=3D2C etc.) it dries in a way that when i touch it the glaze just comes=
o=3D
ff=3D3D
onto my hands as powder.=3D3DA0 What do i add to my liquid glaze to harden=
t=3D
he=3D3D
surface when it dries but does not change the glaze characteristics when f=
=3D
=3D3D
ired?=3D3DA0 I have heard of people adding corn syrup but that kinda promot=
es=3D
m=3D3D
old growth if left to sit for a while.=3D3DA0 Any thoughts?=3D3DA0 Thanks.
=3D20
-----------------------------
=3D20
=3D
Bonnie Staffel on sun 30 oct 11
I found the following information very interesting as to the uses of =3D
CMC:
Applications: widely used in food-making, detergent, papermaking,
oil-drilling, textile, dyeing, ceramics, construction, paint, welding,
battery, medicine, tobacco, toothpaste, cosmetics, etc.
Grades: 1. Food Grade CMC (Sodium Carboxymethyl Cellulose)
2. Detergent Grade CMC (Sodium Carboxymethyl Cellulose)
3. Oil-drilling Grade CMC (Sodium Carboxymethyl Cellulose)
4. Paper Grade CMC (Sodium Carboxymethyl Cellulose)
5. Textile, Dyeing Grade CMC (Sodium Carboxymethyl Cellulose)
6. Ceramics, Construction, Paint Grade CMC (Sodium Carboxymethyl =3D
Cellulose)
7. Welding, Battery Grade CMC (Sodium Carboxymethyl Cellulose)
8. Toothpaste Grade CMC (Sodium Carboxymethyl Cellulose)
9. Tobacco Grade CMC (Sodium Carboxymethyl Cellulose)
10. CMS (Sodium Carboxymethyl Starch)
In reading about the industrial grade, found a variance in the purity =3D
from
50% to 99%. Most of the food grade powder was listed as 99% pure. Most =3D
of
this material is made in China. Some offer free samples, however that =3D
may be
enough to give you some for a lifetime as one needs very little to make =3D
a
batch. Otherwise it is sold at a minimum of metric ton quantities
Perhaps the ceramic suppliers order the industrial grade where mold is =3D
not a
problem if it is not necessary to be as pure..=3D20
Here is the URL for the both grades CMC=3D20
http://xycmc.en.alibaba.com/product/295066222-209753616/CMC_Powder.html=3D2=
0
Amazing the number of foods that this material is added to our food =3D
without
a mention in the ingredient listings.
Regards,
Bonnie
http://webpages.charter.net/bstaffel/
http://vasefinder.com/bstaffelgallery1.html
DVD Throwing with Coils and Slabs
DVD Introduction to Wheel Work
Charter Member Potters Council
Bonnie Staffel on sun 30 oct 11
I agree about adding CMC to harden your glaze. I do it all the time.
However, I have never had my CMC mold or rot. Do I have a different kind of
CMC? I purchased mine so long ago that I have forgotten the name of the
ceramic supplier where I got it.
I might add that if you use a blender, use very hot water and sprinkle the
CMC into it as it is blending. Perfect mixture and ready to almost use it
right away.
Regards,
Bonnie.
http://webpages.charter.net/bstaffel/
http://vasefinder.com/bstaffelgallery1.html
DVD Throwing with Coils and Slabs
DVD Introduction to Wheel Work
Charter Member Potters Council
David Woof on mon 31 oct 11
Hi Bonnie=3D2C=3D20
I have had CMC that spoiled=3D2C and some that did not=3D2C so just as a pr=
ophy=3D
lactic=3D20
measure=3D2C I put one finger of chlorine bleach in each gallon of mix.=3D2=
0
When added to the glaze there is little or no detectable odor of bleach and=
=3D
=3D20
my CMC and glazes are spoil safe.
I remember back=3D2C 30 years or so=3D2C I used a CMC that would dissolve r=
eadi=3D
ly in cold water.=3D20
Now have a small microwave in the studio to heat the water fast and get on =
=3D
with it.
I got some contaminated Red Iron Oxide when I first moved out here. Mixed u=
=3D
p a bucket of=3D20
"Mel's Garage Sale Temmoku" and when I opened it a week later I was sure th=
=3D
ere must be=3D20
a dead cat or rat rotting somewhere in the bucket.=3D20
Out came the bleach and the next firing had a lot of mirror black liner gla=
=3D
zing=3D20
as I quickly used up that glaze batch=3D3B while and with the windows open!=
!!
take care=3D2C
David Woof
__________________________________
2c. Re: powdery glaze surface
Posted by: "Bonnie Staffel" bstaffel@CHARTERMI.NET=3D20
Date: Sun Oct 30=3D2C 2011 3:44 pm ((PDT))
=3D20
I agree about adding CMC to harden your glaze. I do it all the time.
However=3D2C I have never had my CMC mold or rot. Do I have a different kin=
d =3D
of
CMC? I purchased mine so long ago that I have forgotten the name of the
ceramic supplier where I got it.
=3D20
I might add that if you use a blender=3D2C use very hot water and sprinkle =
th=3D
e
CMC into it as it is blending. Perfect mixture and ready to almost use it
right away.
=3D20
Regards=3D2C
=3D20
Bonnie
=3D20
=3D
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