Recipe of Reliable matt (very) yellow cone 6 glaze

[Danielle Gouvea Costa Resende]

Does anyone have a reliable recipe of a Matt yellow (strong yellow)cone 6 glaze? I'm starting to make my own glazes and my attempts with a barium base turn out to be a beige glaze. Thank you in advance. Greetings from Brazil.

[Norm Stuart]

That is beautiful.

George Lewter said:

This is a yellow I've been meaning to try, and will soon. Image and text from Creative Creek Artisans

Ron's Fall Yellow

Nepheline Syenite - 35.5
Ferro Frit #3134 – 13
EPK - 19.5
Dolomite - 16
Whiting - 8.5
Bone ash - 7.5
Bentonite - 2
Tin Oxide - 4
Red Iron Oxide - 1.2 
This is named after Ron Roy who provided me with a great deal of help in developing this mat yellow glaze. This glaze must be thin to medium thickness. Too thick and it will blister. Dick White reports nearly the same surface and color in oxidation.

You may want to check out the oxidation specific glazes on their site - http://www.creativecreekartisans.com/creativecreek_cone6ox.htm

[Ayjay]

I like those Harold,  in fact I like them enough to nick them and try them out.

In the Speckled Yellow, is that 0.2 RIO and 0.4 Tin Ox.?

If it's not, and is actually 2 & 4 I'm wondering how  2 & 4 produces a yellow and 1 & 5 produces Terra Cotta.

[Harold Roberts]

In the speckled yellow the RIO is 2% & tin is 4%. The two glazes are very different. The barium, or if you substitute zinc you can get a bright yellow from iron. If you substitute strontium for the barium, the iron will be very muted. The terra cotta glaze ranges from a red brown when thin to a matte white when thick. You must be careful when it is applied thickly as it struggles to fit on a clay body. The terra cotta glaze is a magnesia glaze and affects iron very differently.

[Ayjay]

Thank you Harold, that's very helpful, (sounds like witchcraft, but helpful nonetheless).  ;)

[Norm Stuart]

Digitalfire provides a nice summary of color witchcraft, although in general terms.

http://digitalfire.com/4sight/properties/ceramic_property_glaze_col...

Specific details gleaned from experience, like those Harold Roberts has provided, are huge time savers.

Barium typically provides a shift in color, such as turning copper blue or manganese pink. Similar to the way that tin can turn chrome pink.

Color is created by refraction and reflection of light by the color compound.  Since kiln temperature creates new compounds, creating glaze colors does not reliably work like a color wheel does with paints, unless you're using something like Mason Stains which are not altered by the heat range you use.

[Cyndy Littleton]

I like the softness of this yellow! Do you have any pieces with the terra cotta?

Harold Roberts said:

This is a yellow matte glaze that I use. There is another overlap glaze I placed on the rim. You can see it more clearly on the cups.

Speckled Yellow Matte

Gerstley Borate ….......02
Barium Carbonate .......15
EPK ….......................23
Spodumene …............27
Wollastonite …...........33

Iron Oxide .....02
Tin Oxide ......04

the overlay is this glaze,

Terra Cotta Matte

EPK ----------------------- 14.0
Bone Ash ---------------- 9.5
Talc ------------------------ 9.5
Dolomite ---------------- 19.0
Nephelene Syenite -- 48.0
Iron oxide --------- 1.0
Tin oxide ---------- 5.0

[Harold Roberts]

Hi Cindy, Here is another example of the terra cotta glaze. You have to be careful how thick you apply it, but the thicker it is the whiter it is. It can run a lot when thick too. I usually use it like in the photo with an overlap on top of another glaze. This is overlapped with my turquoise matte.

  Turquoise Matte

Gerstley Borate ….......02
Zinc Oxide..................15
EPK ….......................23
Spodumene …............27
Wollastonite …...........33

Copper Carbonate .....3
Tin Oxide .................4

[Billie]

I love the soft yellow matte glaze. I want to try it. I haven't made my own glazes yet so all of this is new. The recipe adds up to '98.02". Is the Gerstley Borate .02 or 20%? If 20%, it totals 118.0. Which is correct amounts. Love the turquoise matte as well. Beautiful combinations on the vessel. Just lovely. Thank you for sharing.
 
Cyndy shorter said:

I like the softness of this yellow! Do you have any pieces with the terra cotta?

Harold Roberts said:

This is a yellow matte glaze that I use. There is another overlap glaze I placed on the rim. You can see it more clearly on the cups.

Speckled Yellow Matte

Gerstley Borate ….......02
Barium Carbonate .......15
EPK ….......................23
Spodumene …............27
Wollastonite …...........33

Iron Oxide .....02
Tin Oxide ......04

the overlay is this glaze,

Terra Cotta Matte

EPK ----------------------- 14.0
Bone Ash ---------------- 9.5
Talc ------------------------ 9.5
Dolomite ---------------- 19.0
Nephelene Syenite -- 48.0
Iron oxide --------- 1.0
Tin oxide ---------- 5.0

[Billie]

Oh, and what is clay body for the yellow matte and turqouise pieces? TY again

[Norm Stuart]

This is the Speckled Yellow recipe in Insight-Live, divided into the the traditional "Materials and Additions" format.

Tin Oxide is relatively expensive as a glaze ingredient, but it can give glazes a rich look with an incomparably smooth creamy finish.

[Billie]

Thank you so much...

[Harold Roberts]

Hi Billie, gerstley borate is 2% that will make it add up to 100%. You should use a white stoneware or porcelain. I mix my own but I also like the Laguna 550 Grolleg Porcelain. I fire to cone 6 but I prefer using cone 10 clay.