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blending cmc/bentonite

updated tue 1 nov 11

 

gary navarre on sun 30 oct 11


I put a hard stone or two or a decorative glass marble I found in the clear=
=3D
ance crafts stuff at WalMart in the plastic jar with the slip/glaze so I ca=
=3D
n shake the hell out of it like a spray paint can and remix it before using=
=3D
. Just make sure the lid is tight eh.=3D0A=3D0A=3DA0=3D0AGary Navarre=3D0AN=
avarre Pot=3D
tery=3D0ANavarre Enterprises=3D0ANorway, Michigan, USA=3D0Ahttp://www.Navar=
rePott=3D
ery.etsy.com=3D0Ahttp://www.youtube.com/GindaUP=3D0Ahttp://public.fotki.com=
/Gin=3D
daUP/=3D0A=3D0A=3D0A=3D0A________________________________=3D0AFrom: mel jac=
obson pots2@VISI.COM>=3D0ATo: Clayart@LSV.CERAMICS.ORG=3D0ASent: Sunday, October =
30, =3D
2011 5:54 PM=3D0ASubject: [Clayart] blending cmc/bentonite=3D0A=3D0Abonnie.=
...gre=3D
at information on blending=3D0Awith hot water....cmc.=3D0A=3D0Athat is how =
i make=3D
my bentonite slurry.=3D0A=3D0Ahot water, blend slow...add=3DA0 bentonite=
=3D0Aa lit=3D
tle at a time...keep it up.=3D0Asoon you will have a blender full of=3D0Aa =
thic=3D
k slurry of material.=3D0A=3D0Aadd that to a large skippy (sam's club size)=
pea=3D
nut=3D0Abutter jar. (plastic.)=3D0A=3D0Acover and let set.=3D0Aadd the slur=
ry to a =3D
glaze as you see fit.=3D0A(i put in a quarter cup at a time..)=3D0Amix well=
.=3DA0=3D
in those pesky temmoku glazes i added=3D0Alike 5 percent.=3DA0 hardened li=
ke s=3D
tone, and did not=3D0Aspider web as it dries.=3D0A=3D0Ai hate lumpy bentoni=
te.=3D0A=3D
if you stir your dry glazes well, then you=3D0Acan add it to the mix dry...=
bu=3D
t, often it still=3D0Agets lumpy.=3D0A=3D0Athe wet addition works like a dr=
eam.=3D
=3D0Amel=3D0Ai have always had an issue with gums.=3D0Athey seem to thicken=
the g=3D
laze and i often=3D0Aglaze thinking it is too thick and it winds up=3D0Abei=
ng t=3D
hin and ick.=3D0Aof course that just may be the potter being in-ept.=3D0Afr=
om: =3D
minnetonka, mn=3D0Awebsite: http://www.visi.com/~melpots/=3D0Aclayart link:=
=3DA0 =3D
http://www.visi.com/~melpots/clayart.html

mel jacobson on sun 30 oct 11


bonnie....great information on blending
with hot water....cmc.

that is how i make my bentonite slurry.

hot water, blend slow...add bentonite
a little at a time...keep it up.
soon you will have a blender full of
a thick slurry of material.

add that to a large skippy (sam's club size) peanut
butter jar. (plastic.)

cover and let set.
add the slurry to a glaze as you see fit.
(i put in a quarter cup at a time..)
mix well. in those pesky temmoku glazes i added
like 5 percent. hardened like stone, and did not
spider web as it dries.

i hate lumpy bentonite.
if you stir your dry glazes well, then you
can add it to the mix dry...but, often it still
gets lumpy.

the wet addition works like a dream.
mel
i have always had an issue with gums.
they seem to thicken the glaze and i often
glaze thinking it is too thick and it winds up
being thin and ick.
of course that just may be the potter being in-ept.
from: minnetonka, mn
website: http://www.visi.com/~melpots/
clayart link: http://www.visi.com/~melpots/clayart.html

Bonnie Staffel on mon 31 oct 11


As for further information on how I mix my glazes, I mix one big batch =3D
at a
time as I need the quantity for dipping my larger pots. My container is =3D
a
laundry tub and it is usually 3/4 full after getting it finished. The =3D
point
I am making is that I also use very hot water to add the dry ingredients =
=3D
to
as well. Clay and other ingredients slake much more quickly in hot =3D
water.
Breaks down the surface tension to receive the powders. I wait until all =
=3D
the
powders are wet before disturbing them where if you do not do this you =3D
will
have lumps. I also add the CMC and bentonite to the dry mix before =3D
adding to
the water, stir the dry ingredients somewhat at that time. After adding =3D
to
the water, I then screen it three times. Using a floor scrub brush to =3D
push
the glaze through the screen makes the task much faster.=3D20

I also found, as Mel said, that the CMC adjusts the glaze as to appear
thicker but apply thinner. This is where I use a hydrometer and add =3D
water to
attain the best solution. I use CMC so as to provide me a hard surface =3D
on
which I paint my colors, a majolica technique. This has worked for me =3D
for
many years. Great for double dipping as well.=3D20

Regards,

Bonnie

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