[Clayart] plucking solution

Laura Wilensky laurasclay at gmail.com
Wed Jan 25 10:15:53 EST 2017


The term is new to me, but not the problem! I fire porcelain to hot cone
10, electric. I have made a collection of porcelain tiles, disks, squares,
rectangles, etc., that I paint with kiln wash and then sprinkle 30 mesh
molochite on the wet kiln wash, or dry. My pieces are mostly cups, bowls
and small plates. I put my pieces on these tiles to fire. I do not do high
volume so this works well for me. For plates I often resort to using 8"x8"
kiln shelves with the same treatment.

Laura Wilensky

On Tuesday, January 24, 2017, David Woof <woofpots at hotmail.com> wrote:

> Hi Beverly,
>
> "plucking" happens when the clay body is fired to near total
> vitrification, and the silica and fluxes in the clay body have been drawn
> into a combined melt which forms a glassy matrix in the clay body.
>
>
> This melted sticky glass situation between the foot of the pot and the
> kiln shelf leaves residue of kiln wash sticking to the foot, or some of the
> clay body sticking to the shelf.  There is scaring of the foot when the
> stuck pot is "plucked" away from the shelf.
>
> Stoneware clay bodies, fired to the proper cone, sans salt, soda, and
> other fuming agents, usually doesn't present a problem re plucking.
>
> Porcelain is a different beast, especially porcelain formulated for
> translucency.
>
>
> Misneach,
>
>
> David Woof
>
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>
> ________________________________
> From: Clayart <clayart-bounces at lists.clayartworld.com <javascript:;>> on
> behalf of Beverly Richardson <beverly at aptalaska.net <javascript:;>>
> Sent: Sunday, January 22, 2017 10:08 AM
> To: clayart at lists.clayartworld.com <javascript:;>
> Subject: Re: [Clayart] Clayart Digest, Vol 14, Issue 52
>
> What is plucking?
>
> Beverly
>
> > On Jan 22, 2017, at 10:00 AM, clayart-request at lists.clayartworld.com
> <javascript:;> wrote:
> >
> > Send Clayart mailing list submissions to
> >    clayart at lists.clayartworld.com <javascript:;>
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
> >    https://lists.clayartworld.com/mailman/listinfo/clayart
> Clayart Info Page<https://lists.clayartworld.com/mailman/listinfo/clayart>
> lists.clayartworld.com
> Clayart is an international email-based discussion forum for potters and
> ceramists. Join the Clayart list to find answers to technical questions or
> to become ...
>
>
> > or, via email, send a message with subject or body 'help' to
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> >
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> >
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of Clayart digest..."
> >
> >
> > Today's Topics:
> >
> >   1. Re: aluminum foil (David Woof)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Sat, 21 Jan 2017 23:08:54 +0000
> > From: David Woof <woofpots at hotmail.com <javascript:;>>
> > To: Clayart international pottery discussion forum
> >    <clayart at lists.clayartworld.com <javascript:;>>
> > Subject: Re: [Clayart] aluminum foil
> > Message-ID:
> >    <
> BL2PR08MB2424A4F85B782A57AE40894C6700 at BL2PR08MB242.namprd08.prod.outlook.com
> <javascript:;>>
> >
> > Content-Type: text/plain; charset="windows-1252"
> >
> > Hi Vince,
> >
> > I agree that an 80/20 ratio is an expensive over-kill for most firing
> applications except that i use it for glass tile casting, and because Eric
> initially mentioned concerns re porcelain plucking I offered the 80 al /
> 20epk ratio to cover my arse and his from a bad result, loss, and grumbling
> about bad advice!!!.
> >
> >
> > My red stoneware body with an 0.5% absorption at ^6 also sits on the
> cusp of plucking so again it is 80/20 if I must elevate or level a larger
> piece on balls.   Saving one piece from a plucked foot ring offsets the
> cost of the extra alumina.
> >
> >
> > David
> >
> > ****************************************************************
> >
> > From: Clayart <clayart-bounces at lists.clayartworld.com <javascript:;>>
> on behalf of Vince Pitelka <vpitelka at dtccom.net <javascript:;>>
> > Sent: Friday, January 20, 2017 3:43 PM
> > To: 'Clayart international pottery discussion forum'
> > Subject: Re: [Clayart] aluminum foil
> >
> > Just to add to David's suggestion to use wads to elevate the pots and
> thus eliminate any possible of plucking and other disorders, our standard
> recipe for wadding in salt, soda, and wood, is 40% alumina, 50% china clay,
> and 10% ball clay.  Alumina is by far the most expensive ingredient, so it
> makes sense to cut back on it.  This wadding works just as well as one
> containing a higher percentage of alumina.
> >
> > But if the objective Send Clayart mailing list submissions to
> >    clayart at lists.clayartworld.com <javascript:;>
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
> >    https://lists.clayartworld.com/mailman/listinfo/clayart
> Clayart Info Page<https://lists.clayartworld.com/mailman/listinfo/clayart>
> lists.clayartworld.com
> Clayart is an international email-based discussion forum for potters and
> ceramists. Join the Clayart list to find answers to technical questions or
> to become ...
>
>
> > or, via email, send a message with subject or body 'help' to
> >    clayart-request at lists.clayartworld.com <javascript:;>
> >
> > You can reach the person managing the list at
> >    clayart-owner at lists.clayartworld.com <javascript:;>
> >
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of Clayart digest..."
> >
> >
> > Today's Topics:
> >
> >   1. Re: aluminum foil (David Woof)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Sat, 21 Jan 2017 23:08:54 +0000
> > From: David Woof <woofpots at hotmail.com <javascript:;>>
> > To: Clayart international pottery discussion forum
> >    <clayart at lists.clayartworld.com <javascript:;>>
> > Subject: Re: [Clayart] aluminum foil
> > Message-ID:
> >    <
> BL2PR08MB2424A4F85B782A57AE40894C6700 at BL2PR08MB242.namprd08.prod.outlook.com
> <javascript:;>>
> >
> > Content-Type: text/plain; charset="windows-1252"
> >
> > Hi Vince,
> >
> > I agree that an 80/20 ratio is an expensive over-kill for most firing
> applications except that i use it for glass tile casting, and because Eric
> initially mentioned concerns re porcelain plucking I offered the 80 al /
> 20epk ratio to cover my arse and his from a bad result, loss, and grumbling
> about bad advice!!!.
> >
> >
> > My red stoneware body with an 0.5% absorption at ^6 also sits on the
> cusp of plucking so again it is 80/20 if I must elevate or level a larger
> piece on balls.   Saving one piece from a plucked foot ring offsets the
> cost of the extra alumina.
> >
> >
> > David
> >
> > ****************************************************************
> >
> > From: Clayart <clayart-bounces at lists.clayartworld.com <javascript:;>>
> on behalf of Vince Pitelka <vpitelka at dtccom.net <javascript:;>>
> > Sent: Friday, January 20, 2017 3:43 PM
> > To: 'Clayart international pottery discussion forum'
> > Subject: Re: [Clayart] aluminum foil
> >
> > Just to add to David's suggestion to use wads to elevate the pots and
> thus eliminate any possible of plucking and other disorders, our standard
> recipe for wadding in salt, soda, and wood, is 40% alumina, 50% china clay,
> and 10% ball clay.  Alumina is by far the most expensive ingredient, so it
> makes sense to cut back on it.  This wadding works just as well as one
> containing a higher percentage of alumina.
> >
> > But if the objective is to lift a pot off the surface of the shelf in a
> standard oxidation or reduction firing, then a 50-50 mix of flint and china
> clay works just as well and is CHEAP, but that mix should never be used in
> salt or soda because the flint will attract the salt/soda.
> > - Vince
> >
> > Vince Pitelka
> > Appalachian Center for Craft
> > Tennessee Tech University
> > vpitelka at dtccom.net <javascript:;>
> > https://sites.tntech.edu/wpitelka/
> [https://sites.tntech.edu/wpitelka/wp-content/uploads/
> sites/45/2016/09/09575-033.jpg]<https://sites.tntech.edu/wpitelka/>
>
> Vince Pitelka – Tennessee Technological University ...<
> https://sites.tntech.edu/wpitelka/>
> sites.tntech.edu
> I have been a studio clay artist for 45 years, teaching clay at the
> university level since 1986, the last 22 years in Tennessee Technological
> University’s School of ...
>
>
> > [https://sites.tntech.edu/wpitelka/wp-content/uploads/
> sites/45/2016/09/09575-033.jpg]<https://sites.tntech.edu/wpitelka/>
> >
> > Vince Pitelka – Tennessee Technological University ...<
> https://sites.tntech.edu/wpitelka/>
> [https://sites.tntech.edu/wpitelka/wp-content/uploads/
> sites/45/2016/09/09575-033.jpg]<https://sites.tntech.edu/wpitelka/>
>
> Vince Pitelka – Tennessee Technological University ...<
> https://sites.tntech.edu/wpitelka/>
> sites.tntech.edu
> I have been a studio clay artist for 45 years, teaching clay at the
> university level since 1986, the last 22 years in Tennessee Technological
> University’s School of ...
>
>
> > sites.tntech.edu
> > I have been a studio clay artist for 45 years, teaching clay at the
> university level since 1986, the last 22 years in Tennessee Technological
> University’s School of ...
> >
> >
> >
> >
> >
> > -----Original Message-----
> > From: Clayart [mailto:clayart-bounces at lists.clayartworld.com
> <javascript:;>] On Behalf Of David Woof
> > Sent: Friday, January 20, 2017 2:13 PM
> > To: Clayart international pottery discussion forum <
> clayart at lists.clayartworld.com <javascript:;>>
> > Subject: Re: [Clayart] aluminum foil
> >
> > Hi Eric,
> >
> >
> > Less mess/time, all things considered, have you tried making a: 80%
> alumina/20% Epk "putty" to Elmer's Glue small balls or worms of this putty,
> strategically placed around the feet.
> >
> >
> > I've been doing this for many years.  It also levels a pot placed on a
> warped shelf, and with using larger balls, elevates the piece so that the
> piece heats and cools more evenly for less warping and cracking during all
> phases of the firing and cooling.
> >
> >
> > David Woof..........Take our art seriously......ourselves much less
> so....
> >
> > ************************************************************
> ********************************************
> >
> > From: Clayart <clayart-bounces at lists.clayartworld.com <javascript:;>>
> on behalf of Cynosure -Arts <cynosure_arts at hotmail.com <javascript:;>>
> > Sent: Thursday, January 19, 2017 10:31 AM
> > To: clayart at lists.clayartworld.com <javascript:;>
> > Subject: Re: [Clayart] aluminum foil
> >
> >> From a couple of responses, it seems I need to clarify my question  [??]
> >
> >
> >
> > I'm not looking to have a foil look.   Our studio often uses Alumina
> mixed in wax resist to brush on the feet of porcelain pots to help prevent
> plucking, but the alumina doesn't stay in suspension and it doesn't always
> work that well.
> >
> >
> > I am wondering if one or two flat layers of foil under a pot would leave
> an appreciable and even layer of alumina between the pot and shelf without
> causing other problems.
> >
> >
> > Eric
> >
> >
> >
> > ________________________________
> > From: Cynosure -Arts <cynosure_arts at hotmail.com <javascript:;>>
> > Sent: Thursday, January 19, 2017 5:18 AM
> > To: clayart at lists.clayartworld.com <javascript:;>
> > Subject: Re: aluminum foil
> >
> >
> >
> > Hey all -
> >
> > Has anyone here used disks of aluminum foil instead of kiln wash in
> either a cone 04 electric or a cone 10 redux gas firing.  Before I test, I
> want to make sure I don't end up with clouds of AlOxide floating around the
> kiln ruining other pots.
> >
> > Thx,
> > Eric Newman
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