Comment

Comment by Joseph Fireborn on November 16, 2017 at 5:33pm

Chantay, the original recipe breaks black anywhere it is thin. I think my application was just thinner than the one Norm had posted. 

Comment by Chantay Poulsen on November 16, 2017 at 11:31am

Joseph, have you tested this on a white stoneware?  Did you mention what clay your using? I' m infatuated with the black where it breaks.

Comment by Joseph Fireborn on November 8, 2017 at 5:29am

Yes. It is the "new" orange street. But with some silicon carbide and 24% RIO instead of 12.

Comment by Norm Stuart on November 6, 2017 at 6:24pm

I've never seen the yellow coloration before.   This is using the "New Orange Street"? The one with the lower 7.3:1 Si:Al ratio so it doesn't run?

Increasing amounts of alumina reduce crystallization just as it reduced glaze flow, which is why macrocrystalline glazes are so runny with hardly any alumina.  These are Fayalite crystals (iron silicate)

The increased level of alumina can also prevent pinholes from 'healing' due to reduced glaze flow. 

The red tile shown on the post header uses this original Orange Street with more silica, a 9.2:1 Si:Al ratio.

Comment by Joseph Fireborn on November 6, 2017 at 3:30pm

I did some experimenting with Orange Street. I ran several Currie grid test with increasing amounts of RIO. Up to 24%. I also added .8% silicon carbide. Mostly to see what the results would be as alumina and silica ratios change. I found some interesting grid tiles(26) afterwords and I mixed up some small batches to fire them again on vertical tiles. It wasn't fired in the 1800-1500 50F per hour schedule. It was in a schedule that is close to that but starts at 1700F instead and has some holds along the way. This is the result: 

I also ran the same test without SiC. Here are the tiles compared side by side:

Left Tile: .8% SiC / Right Tile 0% SiC.

The pictures don't show it well, but the right tile is glossy and looks more like a cone 6 electric tile. The right tile is semi matte and has almost a reflective metallic looking surface:

I took it out in the car while I was waiting in line to pickup my son. I like to look at tiles in my spare time. I know... horrible right.

Anyways. I wanted to post this variation of Orange Street. I am going to test it on larger pots tomorrow. I can post those results as well. 

Most of the SiC grid tiles were bad, except for when the Silica and Alumina ratios are below 2.50 and .25. So bordering on the lower ends of the limits. This seems to go along with the findings of other research I have read.

Comment by Joseph Fireborn on October 26, 2017 at 1:11pm

Norm, I think this is probably slightly overfired as well. I will run the test again once I get my kiln calibrated.

Comment by Norm Stuart on October 25, 2017 at 6:36pm

Very nice results which look very much like they do from our kiln with a 50 F slow-cool between 1,800 and 1,500.

You can definitely see the different look the glaze takes on as it moved from the thinly applied black color to the redder oranges of a thicker application.

Inside a bowl where you can apply even more, you can get pools of clearer glass variegated with the other iron colors.

The glaze has more sheen on a dark clay, where all the iron remains in the glaze, and more matte on whiter clays which absorb a lot of the iron.

As you've noted previously synthetic iron oxide, oxidized in tunnel kilns from iron sulfate crystals, is the basic key to a bright red iron glaze. Natural red iron oxide containing other metals like barium or manganese result in a disappointing brown iron glaze.

I reformulated "New Orange Street" with more alumina to silica so it can be applied thickly enough to produce a red even down to the bottom of a pot without running-off.

Comment by Joseph Fireborn on October 25, 2017 at 5:53pm

Here are the results of my orange street test following the new GB recipe with the 50F/per hour cool.

Comment by Tileworks on June 9, 2017 at 12:40pm

New comment on an old thread. That Mossy Mahogany glaze sure looks like a ^10 version of MC6G Waterfall Brown, probably with a bit more rutile.

Cheers

Comment by Tom Anderson on May 31, 2017 at 6:37pm

Norm:
Must say I like this glaze. The slow cool creates an " antiquing" effect- for lack of better terms. The breaking over texture is all the more appealing.

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