Phil Hamling 376 County Route 1 Warwick, NY, USA 10990 e-mail: pdah-at-optonline.net (change the -at- to @) |
Zinc Silicate Crystalline Glaze Pottery A chronicle of my recent progress and a way for me to keep it straight in my head! Click on thumbnails to enlarge photos |
Info I've been asked to keep in confidence.
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May 26, 2009 102nd Firing Results
I tried a new firing schedule this time on these refires. It gave some curious shapes. I'm looking forward to trying it on some new pieces. The chunky glaze on The Wizard's piece just plain old totally over nucleated, is screaming "Uncle" and is on it's way to the "Oops Shelf".
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3 & 4 |
1) It probably doesn't matter how thick and clunky your pots are. If you drop them from 2 ft. onto concrete pavers they will break. 2) Cherry butcher block workbench in and looking for the finishing touches. 3 & 4) Bella wants to know if Burton is up for some hoops.
May 25, 2009 Memorial Day
Once again I'm torn between spending my time making crystalline glazed beauty, gardening, woodworking, banging out a little something at work and doing time in the hammock. No matter what I get to today I know I'll spend a bunch of time thinking about the men and women who served in the Armed Forces protecting the good old USA and creating this "dilemma" for me. |
102nd Firing Setup......Loaded yesterday......3 out of 4 are refires.......with some real chunky zinc oxide on one piece........and some whacky firing schedule I pulled out of my backside.
May 17, 2009
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May 16, 2009 Great new work by Rod & Denyse Simair
May 10, 2009
May 10, 2009 Kiln Brick
May 8, 2009 Political Humor from the Right
May 5, 2009 101st Firing Results (1 disaster sticking to 2 other pieces).
Post Fire Reduction
Before | After |
The pot on the right is an over nucleated refire of a 1% CuCO3, 1/4% CoCO3 piece with clear glaze on top. I figured what the heck I can always re-glaze it if I don't like it. In mild reduction the cobalt seemed to disappear and the green copper showed up. There is only a blush of red on the piece but quite a bit on the catcher. It's not what I had in my minds eye, but still is somewhat interesting.
May 3, 2009 101st Firing Setup
I mixed up a new batch of clear glaze and added a coat over some already fired pieces as well as some bisque. It seems to me I have been putting the glaze on too thin. It's just been very watery. I checked the thickness on some pieces I glazed before and the coat was very thin. Today I mixed it up with only 40% water as opposed to the 65 - 70% I had been using before calcining my zinc and getting poor results. It actually handled much like the glaze I had been used to. I'm keeping my fingers crossed and trying a new firing schedule.
I backed into my reduction kiln with the golf cart, really messing up the gasketing and patch work I had in place to seal it. (Don't you hate when you do that?) I noticed some carbon arcing was starting to happen again through some of the 2300 brick, especially near the element terminals and where the sections join.
I took the opportunity to install new, thicker Superwool paper gaskets between the sections and seal up a few cracks and chunks of missing brick.
April 30, 2009 The many faces of George Garcia
April 27, 2009 100th Firing Results
These results are nothing to crow about. I'll probably end up re-firing most of them. Mother nature did much better with the colors than me. Here's Patti and me almost 23 years ago.. |
April 26, 2009
Today's firing consists of clear base (no titania) with various mixtures of copper carbonate, cobalt carbonate, silver, nickel oxide and 4 varieties of uranium oxide - 2 black, 1 yellow and one orange (which sure looks yellow to me).
2 old packages of uranium oxide from the L. H. Butcher Company, 2034 Bay St., Los Angeles, CA "Chemicals For All Purposes".
April 25, 2009
Bella.......Does the bear sh*t in the woods? No, he craps wherever he wants to . Even in the fairway (after trashing the bird feeder).
April 18, 2009
Kat just got back from a spring break trip to Peru with some of her classmates. She's turning out to be quite the photographer with an eye that catches my eye. She took some great shots around Machu Picchu even remembered her old man when it came to the subject of Inca pottery (What is that anyway? A pipe?). This page has some of her other photos. |
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Today was Thatch Day (or de-thatch day). It was gorgeous all day. |
Vanadium Glaze by Steve Boehme |
Green Dragon by Avril Farley |
David Turner working on the cherry butcher block workbench top. |
April 17, 2009 More beauties from the Pottery Boys (Glenn Woods and Keith Herbrand).
April 15, 2009 Recently acquired work from Ferenc Halmos.
I can see I have a long way to go to even get in the same league with Feri. His glazes are amazing and the pots are feather light.
April 12, 2009 Happy Easter Mr. Wizard!
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Daffodils, Grape Hyacinths and Bleeding Hearts blasting off! |
April 1, 2009
Gordon Czop has been working on a new silicon carbide heated kiln in between those those hard days and nights working on this multiple hearth furnace system used for ore roasting in Alberta, Canada. |
April Fools!?
From Ian Childers, the Pottery Gangsta!.......Forum Post........My White Background w/ Black Crystal How to Guide I think that is cruel and unusual punishment! I caught several people trying to make an April Fool out of me, but the Gangsta is the only one who got me. §Terry, I think Ian was talking about the one on the left. |
Phil, Went to get some of
my work photographed for an exhibition, I had several close ups done, see
one attached. I know you like green!
best Avril PS It
is on a platter that has been twice fired then struck at 750C
Bella thinking about Burton? |
One of Avril Farley's latest |
Bill Schran's John Britt's Goldstone |
Phil, Been playing with John Britt's Goldstone glaze, seeing if I can make it work at ^6 the same as at ^10. I can get aventurine effects very easily with original recipe, but the more fluxed version is requiring more testing. I've attached an image of one of my latest tests. Seems like a horizontal surface and the additional fluxing action of a zinc crystal glaze is showing some promise. Bill
March 29, 2009
100th Firing Setup
Bummer. Oops. I mixed several glazes, glazed a load of pieces and when recording ID's in my notebook realized I had made a major calculation error. I cleaned all the glaze off and will have to start again when the pieces dry.
March 24, 2009
Before and After |
Same pot from 2 different sides |
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First mow job of the year today! |
I've gotta' get organized! |
March 24, 2009 Holly, Swap? Delete? Change?.....How about ADD!
Hey Phil! How about swapping out that old photo of mine on the http://www.puttgarden.com/crystal/Page-crystal.htm page, with the one of the attached. Much more exciting, new work J Lovin the new yellow/red stuff you’re putting out.
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March 23, 2009
The counter on my journal hit 33333 today. I started it 799 days ago. That works out to almost 42 visitors (including me) per day on average. Unbelievable! I doesn't seem like it's been that long. I still have so many un-answered questions, and I'm sure so many un-asked questions as well. |
March 22, 2009
March 16, 2009 99th Firing Results
From Previous Firings | |||
March15, 2009
The first signs of spring
Some crocuses are up in the sunniest spots. |
The snowdrops have multiplied this year. |
Daffodils pushing up through last fall's mulch. |
Did a groundhog do this? No, just Bella diggin' like a dog. |
March 14, 2009 99th Firing Setup
March 11, 2009
March 8, 2009
March 7, 2009 Test Firing
Click here for photos from Feb 27 - Mar 2, 2009 Ginny Conrow and John Tilton Dunedin Fine Art Center, Dunedin Florida. |
February 26, 2009 The girls didn't seem to mind a week on the beach in Florida while I attended the workshop.
February 23, 2009
~1% rutile + .7% red copper oxide + .05% cobalt carbonate |
Refire with clear base glaze. |
Andy Boswell's Current Grouping |
February 22, 2009 98th Firing Results
I think I made a big booboo mixing these glazes but I did get the color distribution I saw in my minds eye on the tall piece. |
Test Firing |
February 21, 2009 98th Firing Setup
I ran this reduction firing with a new 1/4" RCF paper gasket in place under the lid.
February 19, 2009 97th Firing Results
February 18, 2009 97th Firing Setup
96th Firing Results
February 16, 2009
96th Firing Setup |
More "Rough" Reduction
February 15, 2009
February 14, 2009 Humidity Test Results: The addition of water to the kiln while it was firing had a dramatic effect on crystal nucleation and growth. I added water at a rate of ~ 1 drop / sec. which added ~2 IV bags worth over the course of the firing, beginning when the temperature dropped to 1100°C from peak, continuing to ~700°C on the way down. The piece came out over nucleated on the shoulders, with a very sandpaper like feel, and many small, dense crystals on the sides.
February 13, 2009 Second Half of Humidity Test Firing in Doll Kiln
This is an identical piece to that fired on 2-8-09. Same piece, same clay, same glaze, same glaze loading. I have it firing now with everything the same except for the installation of the IV bag and drip tube the Wizard was kind enough to send. The plan is to drip water in to create humidity during the crystal growth portion of the firing. Last night I found that 1 drop per ~5 sec. supplied about 100ml per hour. I will speed this up to get ~2 liters in over the course of the 5 hour growth cycle. I have all my fingers and toes crossed that I won't mess up my kiln.
February 12, 2009 94th Firing Results
This firing gave some interesting results. The overcoat of clear glaze and simplified firing schedule seemed to "cut" the over nucleated mess from the first firing. The piece in my hand is unlike any I've made before. I think I will use some less torturous firing schedules* like this one in the future. I am sure it* , and it's very fast, low temperature segments is responsible for the over nucleation of some of these glazes.
February 11, 2009 94th Firing Setup
I took the 3 dogs from the last firing and applied a layer of clear base glaze. I'm hoping it will cut the glaze which is on there and give less tendency to over nucleate. I'm also firing with a simple schedule consisting of a 1/2 hour cool from top temperature to 1100°C and then a 5 hour ramp down to 1000°C. With 4% CMC whipped into it with the blender it spreads just like cake frosting. |
February 10, 2009 93rd Firing Results
What a mixed bag! My first reaction was negative. I think because there was really nothing that knocked my socks off. In cases like this I go back to something Denis Caraty wrote which helps me deal with it. He wrote "For me there is never bad test. Every result of test is a starting point towards a new direction. And with crystalline glazes, the experience shows that all the directions can be interesting. When a test shows a phenomenon which I do not still know, I pursue my researches around this phenomenon to find the best effects there." Also, paraphrasing, John Mankameyer told me that all his firings are a series of tests. There are some tests you want to duplicate and others you don't care to repeat. Reflecting like this helps me keep a positive spin on things.
The 10% uranium oxide containing line blend probably was the most disappointing of the lot. I did notice that:
-The tile in the center, which contained ingredients closest to the glaze in my 91st Firing, looked nothing like the previous attempt in that it was over nucleated. Is this due to the firing schedule alone?
-.5% nickel oxide (green) and 8% rutile (right) still make bile, even with 10% uranium oxide.
-Even the tiles with the least rutile (left) don't have yellow backgrounds, probably because blue (,25% cobalt carbonate) and yellow make green!
I plan to redo this line blend with the original formula from the 91st Firing (except 10% UO2) on the right and no titania on the left.
The control piece (left) for the upcoming humidity effect test seemed to come out OK and much like the results I saw Russell White had.
Test Firing.....93rd Firing |
February 8, 2009 93rd Firing Setup
The last time I fired was 2 days after Christmas, 43 days ago! I think that's the longest dry spell in 2 years. Now I have quite a few loads of bisque mounted on catchers and seeded, ready for glazing and firing and am looking forward to tackling my "what about this?" list.
The large Andy Boswell piece is glazed with 8% titania base + 2% manganese dioxide + 1/2% cobalt carbonate
One strip of test tiles was prepared to try and get a better handle on glaze variation due to thickness. Tiles were glazed with 5 different glaze loadings of 8% titania base + 2% manganese dioxide + 1/2% cobalt carbonate, The loadings were determined by tracking the weight addition after each glaze layer was applied to each tile, the solids content of the glaze and the area of the tile. The measurements were:
Position | 1* | 2* | 3 | 4 | 5 |
Loading (g/sq.in.) | .8 | .4 | 1.1 | 1.3 | 1.4 |
Thickness (in.) | .030 | .012 | .032 | .038 | .042 |
* These should be reversed.
Another strip of test tiles was prepared to try and understand how titania effects a uranium oxide colored glaze. I mixed a line blend of equal amounts of clear base glaze with 10% uranium oxide, .5% nickel oxide (green) and .25% cobalt carbonate added and then another using an 8% rutile base with the same additions. The rutile contents are:
Position | 1 | 2 | 3 | 4 | 5 |
Rutile (%) | 0 | 2 | 4 | 6 | 8 |
I mixed the leftovers together and glazed one of the pieces with it.
Today's firing schedule is patterned after one from 9-22-08 which gave some nice rings. I added a slow decent from 1120C to try and get a dark interior on this firing, and shortened the time to ~ 6 hours in the growth range to try and get more background.
Firing of September 22, 2008 |
Humidity Test Firing in Doll Kiln
Russell White thinks humidity swings may account for the dramatic differences he sees between the same glaze fired in high and low humidity conditions. To check it out I glazed several small vases with the same amount of glaze (~.85 g/sq.in.) and have one in this firing using a modification of Russell's schedule. I'll repeat the firing with an identically loaded piece while dripping water from the IV bag the Wizard sent. I've seen the kind of differences Russell showed and thought it could be due to glaze thickness variation from one glazing / firing session to the next.
February 7, 2009
Katerina stepped on the lens of her school camera (50mm SLR) by accident and sliced and diced the underside of one of her toes. This sent us to the emergency room for stitches for the rest of the night.
February 4, 2009 Still not glazing......just having too much fun in the mud!
January 31, 2009 More on calcined zinc oxide (or is it moron calcined zinc?)
William wrote: "Phil, Phil, Phil. You are forgetting the basics." in response to my post question "But really, why do we bother with this (calcination)?" Man did he hit the nail on the head! I covered this ground 11-5-07 and I guess totally forgot. Good thing I have a day job hey grasshopper!
I got these 7 pots out of the 25# bag of clay. It threw real nice but I spent way too long at it. I guess maybe my expectations are too high since I've seen the Wizard throw. I seem to have difficulty getting the lump truly centered. No matter the size, no matter how many times I pull the lump up and push it down I still seem to have an un-centered, or un-aligned lump in the middle. You can see these untrimmed pieced, which have been ribbed smooth on the inside, have "uneven lumps" (for lack of a better descriptor) which I'll trim.
January 30, 2009 Calcined Zinc Oxide........getting ready to start mixing glaze.
January 28, 2009 Work, work, work and more work.
January 24, 2009
January 20, 2009 I know I should be glazing but just had to get this out of my head.
Patti calls it "The White House". I wonder what it will look like with crystals on it and hope it holds up to the heat. |
January 16, 2009
Double Dare Workshop - Ginny Conrow and John Tilton
I finally put up a page on the upcoming workshop. It will be nice to see a bunch of my crystalline glaze buddies again in the warm Florida sun (including §).
I'd really like to finish this gizmo and glaze a bunch of stuff this weekend but Phil is going away to college in Vermont and I think I'll be playing family driver. |
January 11, 2009
January 4, 2009
December 31, 2008 Crystalline Glaze Forum Update
In the words of the Moderator, William Melstrom "The old Crystalline Glaze Forum seems to have spontaneously blown up. .....A new, improved Forum is being built here: http://s3.excoboard.com/exco/forum.php?forumid=64484"
Needless to say this is a major bummer. All that info lost?????? Avi Harriman claims to have copied the old Forum (as a text file) around the time the Wizard called role and will attempt to extract the information from this 100 Meg text monster.
I know this has nothing to do with crystalline glazes but it has taken my time away from it! I finally got these rough cut boards stacked to dry flat. Some of them they cupped and bowed as much as 1" along their length in just 1 day of sitting out in the air inside. By the time I've burned through all the firewood this winter it will be time to rotate and restack the boards.
December 30, 2008 More "Off Topic" stuff
December 27, 2008 No lacey crystals here! Something totally malfunctioned, either me or the machine.
This program should have been over in less than 18 hours but at that point it was still in the middle of the ramps. First I noticed during the third up ramp, where it should have gone up full blast at 5555C / hr, it was only heating 1C per minute then that this was due to the fact that only the bottom elements were firing. While scratching my head trying to figure out if my top circuit was fried or if the computer goes brain dead when programmed at this rate the top element mysteriously kicked in. It seemed to repeat this for the last 2 heat cool segments, but on the last kept firing without the top bank of elements. Finally I killed it about 24 hours after starting. I've got to figure out what the deal is! Is it me, the programmer, the switches or what.
December 26, 2008
92nd Firing Setup | |
I'm trying to get lacey crystals using a cycle with repetitive down ramps (per Feri). There are 2 re-fires with a good coating of clear base with an extra 4% CMC blended in to make a thick paste, and 2 red inclusion stained pieces with 1/2% green nickel oxide.
December 21, 2008
I keep looking at these 2 yellow pieces and puzzle over the greenish crystals. They have 7 1/2% you oh two, 1/3% green nickel oxide and 4% titania. Is it the case that blue + yellow = green or that I'm right on the edge of the nickel + titania = bile?
December 19, 2008
December 17, 2008
I logged the firing cycle used on 12-14-08 on my "Firing Schedules" page. Although I kinda see it I am having real difficulty correlating the bands in the crystal to the ramps and soaks in the program. Anybody got any ideas?
December 15, 2008 91st Firing Results
The 2 most yellow ones contain 7 1/2% uranium oxide (a.k.a. urania or uranic oxide)) + 1/3% green nickel oxide + 4% titania.
December 14, 2008
Motor Oil Reduction |
91st Firing Setup |
December 13, 2008
New work from John Mankameyer |
Gordon Czop stopped by today with some recent work which I think looks great. Here's an example of a glaze that does some pretty nice stuff when applied thin. |
Finally got to finish roughing the models of the Christmas tree ornaments I've been turning on a WW II vintage engine lathe. I'll make some adjustable boxes and when the mold soap and modeling clay arrives make the slip casting molds themselves. Maybe I'll have something to show by next Christmas!
December 10, 2008
Turning Ornament Models | Glenn Woods' F644 Start |
December 6, 2008 Crushing and Sieving Hoppa's Zincite
After getting the set of test sieves (with sizes ranging from 12 to 50 mesh) I went at it and found the material right out of the pickle jar to be extremely hard, and had a tendency to cleave into slivers, as opposed to small chunks, when attacked with a mortar and pestle.
I eventually found that if I thermally shocked the material it broke into small regular shaped chunks and crushed much more easily. The first method I tried involved heating a sample in a crucible with a torch until cherry red and then pouring it into a container of water while still glowing. Then I dried the material in a microwave oven before the mortar and pestle. Then I found that if I left it in the microwave past dry the particles electrically discharged between themselves further fracturing them. I wouldn't recommend doing this at home (my attorney made me say that) but it seemed to be the quickest and most productive method and eventually I poured material right out of the pickle jar onto the microwave tray and blasted away.
I ended up with 5 cuts which look like they may of interest. They are -12/+16, -16/+20, -20/+30, -30/+40 and -40/+50 mesh. (The numbers stand for "through 12 mesh and on 16 mesh, etc.) The first 2 cuts seem a little coarse for my liking, but if you use the "stick the seed into leather hard clay right after trimming method", which Fara Shimbo showed us at Wesleyan Potters 2 summers ago, they may be of interest. The last cut seems a little fine to me, but if you subscribe to the § Terry Fallon "pick microscopic seed you can barely see" method it may be OK. -20/+30 and -30/+40 seem to be in the range of what I've used before.
December 2, 2008 90th Firing Results
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December 1, 2008
89th Firing Results | 90th Firing Setup |
November 30, 2008 89th Firing Results: A real mixed bag!
The last day of November brrrought us a dusting of sleet / snow. |
89th Firing Setup |
November 29, 2008
Yo Avi! (again). How's your collection of autographed Crystalline Spectrum posters looking? (Sorry for the lousy photo.)
November 28, 2008
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I recently signed up for the John Tilton / Ginny Conrow Crystalline Glaze Workshop: Double Dare at the Fine Arts Center in Dunedin, FL this spring. I figure if just a little of their aesthetic sense rubs off on me it will be time and $ well spent.
November 20, 2008 I still haven't been able to spend any significant time in the studio. I have my fingers crossed for this weekend. All this talk by the Wizard about cold weather and cutting firewood for the winter prompted me to put these photos up.
November 13, 2008
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