Ken Chin-Purcell on tue 20 feb 01
PotteryCrafts, a UK supplier, lists a series of stoneware
glazes in their catalog that have been developed by
Harry Horlock-Stringer at Taggs Yard. These glazes
are meant for electric firing yet develop some of the edge
effects and color interaction that one sees in reduction firings.
The key ingredient seems to be a "reactive slip" that is used
under the various glazes. The CPA guide book also mentions
this reactive slip under his entry. Of course, no recipe is given...
To tell you the truth I'm not really after the look of his
"classic" faux reduction glazes, but I am intrigued and curious
about this "reactive slip". Does anyone know what's in it?
Superfine silicon carbide? Something more exotic?
If you think it is silicon carbide, what amount would give the
reduction effect without producing pits & craters?
Ken Chin-Purcell
www.chin-purcell.org/pots
Robert Marshall Simpson on tue 20 feb 01
> Ken
>
> You might look in Ceramic Review # 156---Nov/Dec 1995. On page 43 there
is
> an article, "Interactive Glazes" by Damion Keefe. He gives a recipe for
Slip
> #7 that he says is similar to Tagg's Yard R S---1260-1280
> C/oxidation--giving purples, reds, oranges
>
> Blue ball clay 300
> Nepheline sy 350
> Crocus martis 200
> Whiting 150
> Bone ash 100
> Titanium dioxide 35
> Barium carb 50
>
> Hope this helps to answer your question.
>
> Kayte---in foggy, damp Oklahoma
>
> >
>
____________________________________________________________________________
> __
> > Send postings to clayart@lsv.ceramics.org
> >
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> >
>
Ababi on wed 21 feb 01
Hello Ken!
Lana Wilson, In her book: Ceramics: Shape and Surface offers to add SiC to
slip and cover with shiny glaze copper glaze.( ^6 oxidation). As she writes
it is not all proven method, something you have to go on yourself. She
writes about 0.5 to 2% Sic in various mesh and I tell you that the 100 mesh
is good enough.You may by it from abrasive materials supplier.
----- Original Message -----
From: "Ken Chin-Purcell"
To:
Sent: Tuesday, February 20, 2001 11:03 PM
Subject: Reactive Slip
> PotteryCrafts, a UK supplier, lists a series of stoneware
> glazes in their catalog that have been developed by
> Harry Horlock-Stringer at Taggs Yard. These glazes
> are meant for electric firing yet develop some of the edge
> effects and color interaction that one sees in reduction firings.
>
> The key ingredient seems to be a "reactive slip" that is used
> under the various glazes. The CPA guide book also mentions
> this reactive slip under his entry. Of course, no recipe is given...
>
> To tell you the truth I'm not really after the look of his
> "classic" faux reduction glazes, but I am intrigued and curious
> about this "reactive slip". Does anyone know what's in it?
> Superfine silicon carbide? Something more exotic?
>
> If you think it is silicon carbide, what amount would give the
> reduction effect without producing pits & craters?
>
> Ken Chin-Purcell
> www.chin-purcell.org/pots
>
>
____________________________________________________________________________
__
> 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.
>
Lili Krakowski on wed 21 feb 01
Reactive slips and vitreous engobes are names for same thing.
Basically they are engobes that at Intended Firing Temperature will melt
or vitrefy just enough to interact with glaze above. If used as finish on
unglazed pots here will be some shine, but not the permanence (i.d.
resistance to attack by scrubbing, dusting, knocks) of a glaze. If
overfired they will turn to glaze. As with all glazes there is a
temeporature related progression.....My favorite reactive engobes actually
boil underneath the glaze, truly merging with it, while keeping the
precise lines that sliup decoration allows.
Lili Krakowski
Robert Marshall Simpson on wed 21 feb 01
Ken
In the Nov/Dec issue of Ceramic Review (#156), p 42-43, there is an
article"Interactive Glazes" by Damion Keefe. He gave a recipe for a slip
that he says is similar to Tagg's Yard Reactive Slip. The slip fires in
oxidation to 1260-1280 C. and gives purples, reds and oranges under
appropriate glazes.
Slip #7
Blue ball clay 300
Nepheline sy 350
Crocus Martis 200
Whiting 150
Bone ash 100
Titanium dioxide 35
Barium carb 50
If you are interested in reactive slips the article would be worth reading
as he gives several slip and glaze recipes along with pertinent information.
Hope this helps to answer your question.
Kayte---in Oklahoma
----- Original Message -----
From: "Lili Krakowski"
To:
>
____________________________________________________________________________
__
> 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.
>
lois sharpe on wed 21 feb 01
Does any one have recipes to share of these reactive slips? Cone 10 reduction
preferred for me. Has any one worked with a silicon carbide slip
to get crater glazes? Any interesting crater glazes recipes to share or info on
converting a regular glaze to a crater glaze?
Thanks
Lois in Durham NC
Lili Krakowski wrote:
> Reactive slips and vitreous engobes are names for same thing.
> Basically they are engobes that at Intended Firing Temperature will melt
> or vitrefy just enough to interact with glaze above. If used as finish on
> unglazed pots here will be some shine, but not the permanence (i.d.
> resistance to attack by scrubbing, dusting, knocks) of a glaze. If
> overfired they will turn to glaze. As with all glazes there is a
> temeporature related progression.....My favorite reactive engobes actually
> boil underneath the glaze, truly merging with it, while keeping the
> precise lines that sliup decoration allows.
>
> Lili Krakowski
>
RSteigmeye@AOL.COM on wed 21 feb 01
i've noticed that IMCO #5 stoneware has a nice red flashing around glaze in
electric kilns at cone 6 or 8. looks almost like it was wood fired or at
least reduction fired. it may work as a slip too.
zak steigmeyer
cashmere WA
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