AWPottery Posted February 9, 2014 Report Share Posted February 9, 2014 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. Link to comment Share on other sites More sharing options...
Babs Posted February 9, 2014 Report Share Posted February 9, 2014 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! Link to comment Share on other sites More sharing options...
AWPottery Posted February 9, 2014 Author Report Share Posted February 9, 2014 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 Link to comment Share on other sites More sharing options...
Wyndham Posted February 9, 2014 Report Share Posted February 9, 2014 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: 08-06Firing: RakuSurface texture: GlossColor: Shiny Metallic Red, Blue, BlackDate: 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 Link to comment Share on other sites More sharing options...
Norm Stuart Posted February 9, 2014 Report Share Posted February 9, 2014 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. Link to comment Share on other sites More sharing options...
AWPottery Posted February 9, 2014 Author Report Share Posted February 9, 2014 Thanks Wyndham and Norm... Link to comment Share on other sites More sharing options...
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