Archive for the ‘Glazing and Firing’ Category

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Saggar Construction


2010
12.22

This is a bit off-topic for my normal ceramic musical instrument theme, but some of my newer ocarinas are destined to find a place in a newly constructed saggar.   Saggars have been around since the Chinese used them to protect wares from ashes in a wood firing  that would otherwise land on a piece and alter the intended look of the glaze.  Oddly enough, saggars today are used primarily to create unusual firing atmospheres within a kiln to protect the kiln and the other wares from being altered by the vapors created within a saggar. Go figure.

Saggar - Approximately 10 in. clear on the interiorThose who know me won’t be shocked that my saggar creations include a touch of whimsy.  Each new saggar is topped with my own version of a kiln god… generally (in my style) a Nordic-looking dude with a menacing facial expression.  It is a tradition among potters to set kiln gods of varying creatures atop a kiln during the firing process to appease the immensely powerful flames within the kiln to be kind and produce beautiful works.  Don’t go all fundamentalist on me with the kiln god references…it is just me having some fun with a new (to me) clay used for saggar construction.  I am seeing some potential for future sculptural projects that may be born from the saggar womb of  Sagar the Glazinator.

saggar kiln god saggar kiln godsaggar kiln god

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Bottom Knocker


2010
12.11

A Twitter acquaintance, @sherylcoleman*,  responded to a question of mine and used an infrequently used title, Bottom Knocker, as part of her response.  Take heart.  A bottom knocker is nothing kinky, not related to corporal punishment, nor is it a reference to sagging anatomical parts… it is a term used in earlier centuries for an apprentice who worked in the ceramics shop who was responsible for pounding out the clay bases used in the making of saggars.  OK. That is a lot to absorb for my non-ceramic friends.  A saggar is a lidded container used within a glaze firing kiln to hold bisque fired pieces for out-of-the-ordinary glaze firings.  By placing a bisque piece into a saggar, the artist is able to achieve unusual and often unpredictable results in surface coloration due to the controlled atmosphere and chemicals/minerals within the saggar container.

I am constructing several saggars at the moment for experiments with ceramic musical instruments….probably ocarinas, rattles, and small drums.  The clay mix for a saggar is generally about 50% fire clay and 50% grog.   The grog is necessary to handle the extremes in thermal shock from high temperature firings when the saggar is re-used in multiple firings.  Several have advised me not to attempt wheel-throwing  saggar clay because the coarseness from the grog makes it feel like you are throwing sandpaper.  I may give it a try on a small piece.  We’ll see if I have any fingerprints left afterward.   If only that coarseness could be used to grind off the season additions of my bottom…I wouldn’t knock that 🙂

*Sheryl is also the author of a fiber arts and flute blog with a very cool name, Crunchy Banana.

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Quick Bisque Anxiety


2010
11.25

Tea is for TrumpetWrapping up a semester in the clay lab is much like any other college course.  There is a rush to get projects and papers completed and preparation to do for final exams.  Clay, however, tends to have a mind of its own and doesn’t lend itself well to last minute crunches to dry, bisque fire, glaze, and glaze fire.  For relatively simple shapes and pieces that do not include a lot of assembled pieces, a faster drying cycle isn’t a huge risk.  Generally, a very slow ramp up of the bisque firing takes care of any moisture that would otherwise be disastrous in a faster firing cycle.  Complicated pieces like the one shown here include many slip-slurried connections and numerous variations in clay thickness.  Out of an abundance of caution, I often wrap complex pieces up and allow them to dry slowly over several week’s time.  This one was finished just a few days ago and is headed for the kiln in less than a week…needless to say, I am a bit anxious.  Should disaster strike and the kiln gods frown upon my rush, at least I will have a few images for the memorial. *sigh*

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New Ocarinas and a MugPhlute


2010
11.21

Ocarinas & MugPhluteThe last batch of glaze tests included a few pinch pot ocarinas and a MugPhlute.  The natural look of the reduction fired stoneware with minimal glaze accents seems to work well. The pieces in this image are all high-fired stoneware with red iron oxide  brushed into the textured and stamped features.  The glaze is St. John’s Black, applied with a brush.  The Bailey gas kiln, loaded with these clay instruments as well as student projects from this semester, was fired to cone 10.

This semester’s wheel-throwing course pulled me away from making the usual quantity of ceramic musical instruments, but it has also opened new avenues to explore.  Having a respectable palette of stamping, texturing, and glazing combinations will make future project planning easier and, hopefully, more predictable.

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Kiln Opening


2010
11.18

Wall Hung Ceramic Musical Instrument SculptureI have read numerous articles in the ceramic magazines floating around about celebrations and sales associated with the opening of a freshly fired (and cooled-down) kiln.  Personally, I know the excitement and anticipation as a kiln cart is slowly and carefully pulled free, and shelves full of shiny pots suddenly appear to emerge from their firebrick womb. That experience is amazing.  It is rarely what the artist envisioned completely, but there are generally surprises that elevate the spirit even when everything isn’t just perfect.

This past week’s firing was a success. There are a number of keepers and a bunch of glaze testing tiles that show promise for the next round.  The kiln opening was rather bland, however…just a couple of people tugging at a heavy cart without fanfare, but at least with a few instruments for future fanfares.

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MugPhlute Heresy


2010
10.06

It has been almost a month since I constructed a playable ceramic instrument but that doesn’t mean that I haven’t been thinking (and sketching) about it.  For over a year, every instrument that I constructed was purely pinch-pot-handmade…and now I am discovering new possibilities with pieces and parts that are wheel thrown.  Case in point: Trumpet Mugsthe two mugs pictured include horn-like appendages but they do not  play, but the whimsy of MugPhlutes is still there, lurking just beneath the surface.  These are more like steins than mugs, but they open the door for a musical instrument genre of semi-utilitarian sculptural pieces.  These two were designed to rest either vertically (for function) but to appear more sculptural when setting horizontally.

To avoid breaking a record for consecutive months of instrument building, there shall be an ocarina forthcoming soon, even if it is very small…we can’t commit MugPhlute heresy, now can we?

Making Progress – Ready to Fire


2010
09.27

Mugs DryingThe first batch of wheel-thrown wares that resemble something usable are nearly dry enough for a bisque firing.  The bare mug forms from a previous post, now have some surface treatment and the stamp that I use on most of the MugPhlutes.  I’m thinking that a dark blue glaze on the interior that caries over to cover the lip area with be the principal color. Red iron oxide will be washed into the textured areas and shadowed lightly below…after that, a simple clear glaze will cover the handle and all of the outside (except for the lip).  Three of the mugs will be used to test other glazes.  The six that are close enough to call a set will be glazed consistently.

The ware boards on my shelves seem to be filling up with new work.  I hope that is a sign that my technique is improving. The next assignment for class is 20 bowls. That shouldn’t be a huge deal, but I have other projects that keep pulling me back to some interesting sketchbook work…I guess that’s progress.