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Substitute For Black Copper Carbonate


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#1 AWPottery

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Posted 09 February 2014 - 02:12 PM

I have a raku glaze called Lubbock Red Blue Black that calls for Black Copper Carbonate.  I didn't see any at the community center were I take pottery classes at and was wondering if there was some other substitute I could use for it.



#2 Babs

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Posted 09 February 2014 - 04:48 PM

I have a raku glaze called Lubbock Red Blue Black that calls for Black Copper Carbonate.  I didn't see any at the community center were I take pottery classes at and was wondering if there was some other substitute I could use for it.

Black Copper carb or oxide, haven't come across black copper carb, maybe it's the oxide you're after.

Marcia is the one with this knowledge. Raku diva!



#3 AWPottery

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Posted 09 February 2014 - 05:03 PM

I double checked the recipie as well to make sure it wasn't oxide instead of carbonate, but it called for carbonate. 

 

The recipie was as follows

 

Lubbock Red Black Blue (Raku glaze)

Ger. Borate 70

Ball Clay 30

Add:

Tin Ox 1.5

Black Copper Carb 5



#4 Wyndham

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Posted 09 February 2014 - 05:04 PM

 Black Copper carb is Likely a misquote. Black Copper oxide and oxides are usually stronger than carbonate's. Here's what I found

 

Glaze name: Lubbock Red Black Blue

Cone: 08-06
Firing: Raku
Surface texture: Gloss
Color: Shiny Metallic Red, Blue, Black
Date: 07/19/98

Recipe: (Percent, Batch)

Colemanite                 70.00       70.00

Ball clay                  30.00       30.00

                        --------    --------

Totals:                   100.00      100.00

Also add:

Tin oxide                   1.50        1.50

Copper carbonate            5.00        5.00

Comments:

Comments: Glaze type: Raku (Reduction) Transparency: OpaqueColor: Shiny

    Metalic Red, Blue, Black and Silver Visual texture: Random colors Flow:

    Slight Date: 07/07/97 Comments: This is one of the most beautiful Raku glazes

    I've ever seen. There is a lot of metalic silver with a little gold and the reds,

    blues, and blacks mingle in with it (they are metallic too). Proper reduction in

    an airtight container is a must. I fire the piece until the glaze is shiny.

    Immediately I place it in a trash can filled with shredded newspaper and throw

    more on top after the piece is in. Then quickly secure the lid over it. Seems to

    work even better if the paper is really blazing good before the lid is put on.    The colors are random but nearly all are always present somewhere if reduced

    properly. I use a galvanized trash can with a lid that fits securely occasionally

    I'll use a sand pit with a metal bucket. *Variations: Can replace Copper Carb 5

    with Black Copper Oxide 2.5 - I have gotten the same results *How long have

    you been using this glaze? About 4 years *Where is it used? Texas Tech

    University *What do you like most about this glaze? The metallic look *Is

    this glaze reliable? Yes *How do different firing temperatures/atmospheres

    affect the glaze? We always do it the same. *How does the glaze behave on

    different clay bodies? Pretty much the same effect. Colors are brighter on white

    clays. *What consistency should the glaze be for pouring/dipping? About the

    consistency of chocolate milk. *How thickly should the glaze be applied to the

    pot? Medium. I use two quick dips. *What is your kiln type and size? We use a

    gas burning Raku kiln. It is about 24 in diameter. The base is made from a

    section of an old electric kiln. There is a hole in the side for the burner. The top lifts off and is made of a wire frame with flame blanket for the insulation. (I

    dont know if flame Blanket is the real name but it is a fiberous white material.)

    *How do you typically fire? We fire the pot till the glazes becomes shiny, then

    kill the burner, lift off the lid and place the pot in containers filled with

    shredded paper. When it ignites (instantly) we throw more paper on top and

    close the lid. We leave it in there about 15 minutes before taking it out to cool.

 

 

Hope this helps

Wyndham


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#5 Norm Stuart

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Posted 09 February 2014 - 05:07 PM

Five grams of black Copper Oxide is the same as 7 grams of green Copper Carbonate.

 

I have a raku glaze called Lubbock Red Blue Black that calls for Black Copper Carbonate.  I didn't see any at the community center were I take pottery classes at and was wondering if there was some other substitute I could use for it.



#6 AWPottery

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Posted 09 February 2014 - 05:14 PM

Thanks Wyndham and Norm...






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