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Thursday, November 19, 2009

Washes Over Thrice Fired Pots

Do not put a 50/50 Gerstley Borate and Frit 3134 wash over very dull, matt surfaces and fire them to 1888°F in a gas kiln hoping for better than previous results!
This does not work a'tall !!!

Wednesday, November 18, 2009

Glaze Combo

This is an awesome glaze combination at temps 2020°F electric oxidation firing.

50 Frit 3419
10 Neph Sye
5.5 Fireplace Ash
3 Lithium
14.7 Silica
5.4 Whiting
1 Cobalt Carb
3 Lithium
2 Tin

Apply first, then apply the following glaze over this.

52.5 Frit 3124
9 Silica
14.7 EPK
4 Lithium
10.6 Zinc
7.8 Custer feldspar
5.4 Whiting
1/2 Copper Oxide
2 Lithium
1/2 Cobalt Carbonate
2 Tin

Note: i measure in parts, using 1/8th teaspoon as a base measurement, so all of the above portions are in 1/8th tsp measurements.

Firing schedule:
200°F to 300°F
324°F to 1250°F
Full to 2000°F
Hold 15 minutes (see notes on this in previous post)
Full to 2020°F
Hold 20 minutes
Full to 900°F
Hold 40 minutes

Be aware: Both of these glazes run like crazy.
Note: by adjusting the tin oxide amounts in the additives, one can achieve different shades of blue yet with the same startling effects of the two glazes combined.

Ignore the outside of these pieces (these were all glaze tests and i usually try 3-4 per cup). Focus instead on the inside blues. Guess i oughta mention, ignore the quality of the photographs too!
For these are richly saturated blues with riverlets of blue, green, black and wee specks of pink adding a "richness" and depth to the overall finished glaze.
Happy glazing days to y'all

Sunday, November 15, 2009

Nother Glaze Database

Good Sunday Mornin' to y'all

If you're trying to find low-fire glaze recipes, this is an extremely useful database !!!

Many thanks to Linda Aarbuckle, who has spent many hours compiling it !!!
She, also, has a raku recipe database. Just replace the word lowfire with raku in the address bar to reach it, then add it to your favorites list.

Way down towards the bottom of the list, there are some recipes for lustre glazes, too !!! Haven't tried them out yet but now that i can no longer find a source for Amaco Gold Lustre, will be attempting some of them in the near future.

Happy glazing days

Sunday, November 8, 2009

Glaze Worth Mentioning

If you are working in the 2020°F glaze firing range, this glaze works well. It strongly resembles a "floating blue". The color is much more saturated and a richer blue than my photo shows.
It's a high Gloss where applied thick and doesn't run. Oxidized, electric firing.
Base Glaze:
52.5 Frit 3124
14.7 Silica
3 Lithium
7.6 Zinc
7.8 Cornwall Stone
5.4 Whiting
2 Tin Oxide
2 Lithium (that's in addition to the 3 in the base glaze)
1/2 Cobalt Oxide

Note: i measure by parts. And use 1/8th tsp as a base measurement. Thus: 1/2 cobalt oxide would be: 1/2 of 1/8th tsp. Plus: i halved the above base recipe but didn't half the additives: tin, lithium and cobalt oxide.

I was seeking a pink. Spozedly lithium and cobalt oxide will produce a pink. But this didn't.
Still -- am quite pleased with the "floating blue". It's a keeper.
On the inside: Where applied thin, it's a steelish blue; the areas where 2+ coats were applied are the sections it "floated". Plus, (on the outside) where applied over a yucky chocolate brown glaze, it covered it well but the double-glaze is nothing to write home about.

Firing schedule:
200°F to 300°F
324°F to 1250°F
Full heat to 2000°F
Hold: 15 minutes
Full heat to 2020°F
Hold: 20 minutes
Full ramp speed drop to 900°F
Hold: 40 minutes

Explanation: the only reason the hold is between the 2000°F and the 2020°F, is because my Paragon kiln doesn't operate as it should and shuts itself off !!! Thus, i added an un-needed hold in order to coax it to reach 2020°F and this seems to work for this kiln. If i were firing a normal kiln, i would fire at full heat straight thru from the 1300 to the 2020°F. However, if my kiln operated correctly, i would be firing to Cone 6 !!! instead of recomputing all my glazes to the lower temp.

Wednesday, November 4, 2009

Fiddlin' Around


Have recently been teaching clay classes.
Decided that having a theme would move the classes along in a somewhat orderly progression.
Chose musical instruments.
Had already started this banjo as a model for the first class, when i realized, much to my dismay, that it surpassed the abilities of the enrolled age group.
Have spent the last couple of weeks remodifying my game plan.
We're still doing musical instruments.
Just on a drastically more basic level.
Still, without the motivation of teaching classes, it would never have occurred to me to try and create a banjo !!!
The tuning pins were a bit of a logistics problem. But think i have this solved.
The next challenge is: how in the world to i prop this upright in the kiln? If it warps a'tall, i'll be in the soup.
Have a day or two to figure this out while the clay dries before bisque firing . . . .
Am just a'hopin and a'prayin that it survives both the bisque and glaze firings, and then, actually makes music !!!