Cherie W on tue 11 jan 05
Hi, is it possible to thicken slip? Can I add something to it to make it
a thicker consistancy??
Thank You
Cherie
WHC228@AOL.COM on tue 11 jan 05
A little epsom salts
Cherie W on tue 11 jan 05
Thats it??? Just add some epsom salt to the slip and it will thicken the
the consistancy???? That sounds almost too easy :):)
WHC228@AOL.COM on tue 11 jan 05
Just be careful. A little Epsom salts go a long way. There are other
chemicals that you can use, however they probably aren't as close as your nearest
drug store.
Precipitated calcium chloride, Or snow white work well. You can actually use
plaster ( magnesium carbonate.)
What you are doing is moving your slip back up the deflocculation curve.
Bill Campbell
Ron Roy on tue 11 jan 05
Vinegar works unless it's too thin - so will Epson Salts disolved in hot water.
RR
>Hi, is it possible to thicken slip? Can I add something to it to make it
>a thicker consistancy??
>Thank You
>Cherie
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Cherie W on wed 12 jan 05
Thank You so much for your response..I tried it last night and it was
messy, but it worked..I took a cake bag and tip filled it with slip that
was mixed w/ epson salt and I was able to sqeeze out a design onto
tiles...it took a few tries and I had to keep changing the tip to smaller
ones as I would ruin a design w/ some slip wanting to escape, but once I
found the right size tip..it worked great..I was able to make some rose
buds with a raised effect on some tiles..I added some little leaves and I
loved how it turned out..anyhow..Thank You again for your help!!
Cherie
Tig Dupre on wed 12 jan 05
---------------------------<>-----------------------------
Thats it??? Just add some epsom salt to the slip and it will thicken the
the consistancy???? That sounds almost too easy :):)
---------------------------<>-----------------------------
Cherie,
Yep. Simple, ain't it? BUT...
Heat water to near boiling. Stir in epsom salts until the water begins to turn cloudy. That's near-saturation point. Let the solution cool.
I add about 2-3 tablespoons of the epsom salts solution to about 3-4 gallons of glaze. Be CAREFUL! Adding too much will turn your slip into a glutinous, unusable mass. Add a little at a time and stir well in between. When you see it thicken to about the consistency of thin melted ice cream, you're there.
It also works well for those glazes that have a tendency to hardpan. Some of my recipes will create geological concrete if I don't add some epsom solution. Just a little does the trick. Nice, creamy glazes that adhere well, and fire well.
Best regards,
Tig Dupre
in Port Orchard, Washington, USA
Ben on wed 12 jan 05
glazes that adhere well, and fire well.>
Someone really should do a chapter on slip rheology.
Ben on thu 13 jan 05
Technology for Potters and Sculptors">
I have it. I've read it several times. As you said: a kick start.
Something between that and drowning would be helpful to the potter who
wishes to gain a better understanding of the range of possibilities in
controlling the consistency and application qualities of his glazes in the
studio setting without the necessity of the full scientific molecular
relationships presented for example by Frank Hamer. Sometimes one loses the
forest through the trees. As much as I like trees:-) I'd like to have a
look at Lawrence and West. Thanks for the references.
Take care,
Ben
P.S. Is Redhill in N.S.W.? I have some friends in Picton.
Cherie W on thu 13 jan 05
As I said in a prwvious post..I was able to thicken the slip by adding
epsom salt..I took a cake bag and was able to make some designs ..they
werent perfect, but I was very happy w/ how they had turned out thinking I
could clean up the greenware a bit before firing..well..my designs sort
clumped up..instead of looking like little rose buds w/ small leaves it
just looked like little balls of slip on my tile...I didnt boil the water,
I just used hot water..so I will try that..Can I make is so slip is the
consistancy of creme? Like cake frosting?? Im open to any suggestions...I
would just like to make some intricate designs on tiles using slip..I am
wide open at this point as I was messing w/ it again last night for about
3 hours...Thanks again for any help!
Cherie
Ben on thu 13 jan 05
Hi Pat,
I'd like to understand it better at a practical level myself. I'm not so
interested in the chemistry except in a general way. It is true that
flocculation and deflocculatiion are essential electrical (or perhaps more
accurately electromagnetic) phenomenon , the attraction or repulsion of
particles according to their charge adjusted by "electrolytes" Vinegar,
magnesium sulphate(Epsom salts), calcium chloride, sodium carbonate (soda
ash) and sodium silicate to name a few. (acids bases or their salts which
affect the charge of the particles. - I'm sure one of our chemists will
clarify this I'd have to go look it up to give accurate definitions.)
But I'm more interested by how it applies and surprised by the lack of
discussion in most glaze literature. If a text goes much beyond describing
glaze as the "thickness of cream" and "learn to judge by experience." it
might get as far as specific gravity and timing for glaze thickness. You
see obscure references to things like epk having nice gelling properties and
potters liking it in their glaze batch
but no clear and thorough discussion of the ability to control the
consistency or thickness of a glaze (not just density) by choice of
materials (i.e. amount and type of clay) flocculation or deflocculation and
the advantages or disadvantages of doing so in various circumstances.
Like Tig I've used epsom salts in some of my glazes and found the gave very
good control in application and a very smooth coat but I haven't done it
wholesale (one more thing to fiddle with I can't focus on yet) The first
time I tried it (Sorry Mel) was on overfired bisque as the only reference
you find to it is to assist glaze adhesion on vitrified ware. It was like
"wow this is great" how come no one ever told me this or discuss it in
literature. I liked it enough I used it on several batches of good bisque.
Wish I understood it well enough to write the chapter... I hope somebody who
does will though.
----- Original Message -----
From: "Pat Southwood"
To:
Sent: Wednesday, January 12, 2005 4:39 PM
Subject: thicken slip?
Hi List,
Ben, what is rheology?, I cant be the only person that hasn't come across
this word before.
Are you referring to electrical currents travelling somehow, - through
slip?
Do epsom salts generate electricity,?
I don't understand.
Please explain, - I slept through chemistry at school because no-one
contextualized it for me in terms of pottery.
Best Wishes,
Pat Southwood.
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Ivor and Olive Lewis on thu 13 jan 05
Dear Pat Southwood,
You must have opened an eye for a moment in your Physics class to
recall the Rheo---stat, an instrument for governing the flow of
electricity, like a water faucet
Rheology is the Science of flowing stuff, about viscosity and
plasticity.
Best regards,
Ivor Lewis.
Redhill,
S. Australia.
Ivor and Olive Lewis on thu 13 jan 05
> Someone really should do a chapter on slip rheology.<
Dear Ben,
Lawrence and West have a brief chapter in "Ceramic Science for the
Potter"
Best regards,
Ivor Lewis.
Redhill,
S. Australia.
Pat Southwood on thu 13 jan 05
Hi List,
Ben, what is rheology?, I cant be the only person that hasn't come =
across this word before.
Are you referring to electrical currents travelling somehow, - through =
slip?=20
Do epsom salts generate electricity,?
I don't understand.
Please explain, - I slept through chemistry at school because no-one =
contextualized it for me in terms of pottery.
Best Wishes,
Pat Southwood.
Ivor and Olive Lewis on fri 14 jan 05
Dear Ben,
If you get into the archives, not the electronic ones but the real
paper and ink stuff. there is so much information you would drown
under the volume. But if you are looking for the quick fix solution to
getting a little more knowledge then Yvonne Hutchinson Cuff, Ceramic
Technology for Potters and Sculptors" might kick start your learning.
She has close to twenty pages on the topic. She will lead you by
degrees through the "Twaddle"
Best regards,
Ivor Lewis.
Redhill,
S. Australia.
<< but no clear and thorough discussion of the ability to control the
consistency or thickness of a glaze (not just density) by choice of
materials (i.e. amount and type of clay) flocculation or
deflocculation and the advantages or disadvantages of doing so in
various circumstances.>>
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