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Dyeing Clay


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#1 Brittany

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Posted 19 June 2013 - 02:26 PM

Is there any other way to dye clay without using colorants? Like natural things or household things that won't alter the way the clay fires?



#2 oldlady

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Posted 19 June 2013 - 02:37 PM

why are you asking this?
"putting you down does not raise me up."

#3 Brittany

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Posted 19 June 2013 - 02:39 PM

why are you asking this?

I don't have any colorants and was just curious if there were other ways.



#4 Marcia Selsor

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Posted 19 June 2013 - 02:52 PM

coloring clay is done with oxides like iron or ochre. Rust is iron, but it is better to use processed materials or you could get a puncture from a sharp piece.
Maybe you are lucky to have an iron bearing clay nearby that your could use to deepen the color. It really depends on what you're trying to do.
Brighter colors are commercially made with rarer metals.

If you are pit firing, yellow ochre can give you a red earthen color if you oxidize the firing.
So, you really need to be more specific with what you are trying to do.

Marcia

#5 Brittany

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Posted 19 June 2013 - 03:03 PM

I was looking for ways to make a blue colored clay, but since the processed way is safer what would be a good recipe for a deep blue clay with colorants?





#6 Marcia Selsor

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Posted 19 June 2013 - 03:22 PM

what clay are you starting with? What is the firing temperature?

Marcia

#7 Brittany

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Posted 19 June 2013 - 03:46 PM

what clay are you starting with? What is the firing temperature?

Marcia


It's white low-fire clay with grog



#8 Marcia Selsor

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Posted 19 June 2013 - 07:03 PM

And why do you want to dye it? Are you needing a solid blue clay?
Could you use an Amaco Underglaze?

Marcia

#9 neilestrick

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Posted 20 June 2013 - 03:30 PM

Natural dyes like you would use on fabric will just burn out during firing. Metallic oxides are necessary to create color in ceramics. You are welcome to scrape as much rust off my car as you want.

Blue can be created in glazes with iron, copper or cobalt, depending on the glaze formula and firing method. For coloring clay however, cobalt is necessary to make blue. I prefer adding it into a slip and then letting the slip dry out to a workable consistency.

Neil Estrick
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neil@neilestrickgallery.com


#10 Brittany

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Posted 21 June 2013 - 11:35 AM

And why do you want to dye it? Are you needing a solid blue clay?
Could you use an Amaco Underglaze?

Marcia

I want to make a solid blue clay for multiple projects, then also make a marbled appearance by wedging the blue clay with with the normal white clay.



#11 OffCenter

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Posted 21 June 2013 - 11:56 AM


And why do you want to dye it? Are you needing a solid blue clay?
Could you use an Amaco Underglaze?

Marcia

I want to make a solid blue clay for multiple projects, then also make a marbled appearance by wedging the blue clay with with the normal white clay.


You need to order a half pound (more or less depending on how much clay you plan to color and how dark you want the blue) of cobalt carbonate at close to $30 a pound. Cobalt carb is weaker than cobalt oxide but it is less likely to speckle and more likely to give you a smooth, even blue and much better light blues. It's strong so you will not need much. A half pound would probably color 25 lbs of clay a medium light blue. If I'm wrong here, Chris will probably correct me.

Jim
E pur si muove.

"But it does move," said Galileo under his breath.




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