Yellow Matte

I have been working on a yellow matte glaze. One of our interns left a bucket of glaze and it looks like the glaze on the apple baker. I have been trying to repeat the glaze and the small ikebana form is as close as I have come. I know it's an iron based yellow as the glaze is red in the bucket. The intern was heading out west and I have not been able to find her. Does anyone have any idea what I could add to mine to make it more yellow? I'm thinking some rutile. Thanks for any advice.

Jeff



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Permalink Reply by Jeff Gieringer on January 13, 2010 at 6:50pm
It is a ^6 oxidation glaze. I'm getting closer, but can't quite get the yellow to come out.

Jeff
Permalink Reply by Jeff Gieringer on January 13, 2010 at 7:23pm
Highwater's Red Rock

Nancy Darm Kuefler said:
Love it. Reminds me of a ^10 Bird Matte. What kind of clay?
Permalink Reply by Joan Worley/Jess McKenzie on January 14, 2010 at 4:11pm
We certain you've thought of vanadium. But how does it act with iron in the glaze?
If iron is present, wouldn't a better bet be Val Cushing's Tenmoku Gold?
Zoophagous posted a recipe on our TeaDust Forum.

http://cone6pots.ning.com/forum/topics/tea-dust-glaze?id=2103784%3A...

~joan worley and jess mckenzie
Permalink Reply by Joan Worley/Jess McKenzie on January 14, 2010 at 4:15pm
Here's something more on Val's Tenmoku Gold

http://www.frogpondpottery.com/glazestability/glaze0013.html

Please let us all know how this comes out.
~j&j
Permalink Reply by Jeff Gieringer on January 14, 2010 at 5:09pm
J&J,

The bottom picture above has 2% Vanadium in it. I didn't know whether to add more Vanadium or try Ochre. Thought about rutile. The unknown glaze in the bucket is iron red, so I don't know what makes it yellow on the pot.

Jeff
RAMPermalink Reply by RAM on January 14, 2010 at 6:54pm
Could chromium be in it, or some kind of Vanadium Zirconian Stain, or a Praseodymium Stain? I just looked up any compound that would turn a glaze yellow. The Praseodymium Stain seems like the best choice if the rutile option dosent work out because it is best in oxidation, and for some reason I feel like there might be a small amount of tin in the glaze.... Also, I have noticed that .1% cobalt carb is usually in most of the yellow glazes I have been looking at from various sites (never tested any, or saved any recipes)
Permalink Reply by Joan Worley/Jess McKenzie on January 14, 2010 at 9:57pm
You might want to look at some of Alisa Clausen's photos, if you haven't already.
See
http://tinyurl.com/yz6luwa
which should show you V's Tenmoku Gold that's full of pyroxene (we guess) crystals.

But click also to the right on
iron,Ochre, Browns ^6 Ox (Set)
There's one called 'Dry Pumpkin' that might look yellow on your Red Rock.
Just a WAG
~j&j
Permalink Reply by Jeff Gieringer on January 15, 2010 at 4:14am
J&J

Thanks again, I have tested Alisa's Dry Pumpkin and the Butterscotch, but don't get the iron spots with them. But looking at the recipes again has given me a couple of ideas to try in mine.

Jeff
Permalink Reply by Joan Worley/Jess McKenzie on January 15, 2010 at 7:13am
Please keep us posted. We love a mystery.
BTW, we're not familiar with that clay body--we thought the spots came from it, not the glaze, given your second photo.
This has been a great lesson on the importance of keeping a notebook, as well as good labels. Perhaps she was a good intern in other respects.
j&j
Jeff Gieringer said:
J&J

Thanks again, I have tested Alisa's Dry Pumpkin and the Butterscotch, but don't get the iron spots with them. But looking at the recipes again has given me a couple of ideas to try in mine.

Jeff
Permalink Reply by Joan Worley/Jess McKenzie on January 15, 2010 at 9:08am
One last shot. (We keep running across these):

See the discussion--especially the Dan Dermer msg-- at

http://www.potters.org/subject27988.htm

There's some talk about crystals, but they don't seem to say what color those are.

Good luck...~j&j
Permalink Reply by Jeff Gieringer on January 15, 2010 at 5:47pm
J&J,

The spots do come from the glaze, that's why I couldn't understand why they didn't show up with Alisa's 2 glazes. I'll keep you updated as we continue our testing.

Jeff


Joan Worley/Jess McKenzie said:
Please keep us posted. We love a mystery.
BTW, we're not familiar with that clay body--we thought the spots came from it, not the glaze, given your second photo.


Jeff
Permalink Reply by Joan Worley/Jess McKenzie on January 15, 2010 at 9:07pm
We hope you do keep us updated. It is truly a mystery--if you strain that glaze and find find lots of mm-size hunks of rust we won't be a bit surprised...;-)
~j&j

Jeff Gieringer said:
J&J,

The spots do come from the glaze, that's why I couldn't understand why they didn't show up with Alisa's 2 glazes. I'll keep you updated as we continue our testing.

Jeff


Joan Worley/Jess McKenzie said:
Please keep us posted. We love a mystery.
BTW, we're not familiar with that clay body--we thought the spots came from it, not the glaze, given your second photo.


Jeff

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