Steven D. Lee on fri 4 apr 03
I finally learned what was in the glaze I had used for my 1st raku
firing and calculated approximately the additions in it plus the
additions I made. Here it is:
Gerstley Borate 75%
F4 Feldspar 18%
Zircopax 7%
Add:
Cobalt Carbonate 4%
Black CU Oxide 4%
I threw my pieces using Raku Clay from Armadillo Clay and Supply in
Austin TX and bisqued them to Cone 03. I then washed the pieces and
allowed them to dry overnight and then used a single dip of about 1
second in a milk consistency glaze of the above recipe. I allowed
the pieces to dry 48 hours after glazing before firing.
I fired the pieces using propane at 8psi and a MR100 Venturi Burner.
I waited until the entire surface was glassy and slick looking and
then post-fire reduced using shredded documents and Xerox Copy Paper.
The Post-Fire Reduction lasted about 30 minutes per piece, with 2" of
paper below and 2" above the pieces in a galvanized trash can with
the lid shut tight.
After opening I sprayed the pieces with a bug sprayer first and then
walked over to my garden hose and doused them until they were cool.
With this in mind, I talked with another potter who has done some
Raku and he said that he couldn't believe I got the shiny metalic
copper surface that I did. He said that only with Stanous Chloride
fuming could he or other Rakuists he knew get that surface.
I guess I would like some feedback on why this combination of
procedures and materials created the surface that I saw in all of my
Raku Pieces.
The pieces are at:
http://www.sdpottery.com/Ceramic_Misc/New_Arrivals.htm
Thanks!!!!
***************************************************
Steven D. Lee
SD Pottery - The Little Texas Potter
http:\\www.sdpottery.com
millenial_age@yahoo.com
14341 FM 112
Thrall, TX 76578
512-898-5195
***************************************************
Lorraine Pierce on fri 4 apr 03
Hi Steve...beautiful copper raku glaze...my question is, what brand of bug
spray? That is the only unusual step to me! Lori Pierce in New Port
Richey, Fl.
----- Original Message -----
From: "Steven D. Lee"
To:
Sent: Friday, April 04, 2003 9:01 AM
Subject: Perhaps and Unanswerable question about Raku Glaze
> I finally learned what was in the glaze I had used for my 1st raku
> firing and calculated approximately the additions in it plus the
> additions I made. Here it is:
>
> Gerstley Borate 75%
> F4 Feldspar 18%
> Zircopax 7%
>
> Add:
>
> Cobalt Carbonate 4%
> Black CU Oxide 4%
>
> I threw my pieces using Raku Clay from Armadillo Clay and Supply in
> Austin TX and bisqued them to Cone 03. I then washed the pieces and
> allowed them to dry overnight and then used a single dip of about 1
> second in a milk consistency glaze of the above recipe. I allowed
> the pieces to dry 48 hours after glazing before firing.
>
> I fired the pieces using propane at 8psi and a MR100 Venturi Burner.
> I waited until the entire surface was glassy and slick looking and
> then post-fire reduced using shredded documents and Xerox Copy Paper.
> The Post-Fire Reduction lasted about 30 minutes per piece, with 2" of
> paper below and 2" above the pieces in a galvanized trash can with
> the lid shut tight.
>
> After opening I sprayed the pieces with a bug sprayer first and then
> walked over to my garden hose and doused them until they were cool.
>
> With this in mind, I talked with another potter who has done some
> Raku and he said that he couldn't believe I got the shiny metalic
> copper surface that I did. He said that only with Stanous Chloride
> fuming could he or other Rakuists he knew get that surface.
>
> I guess I would like some feedback on why this combination of
> procedures and materials created the surface that I saw in all of my
> Raku Pieces.
>
> The pieces are at:
>
> http://www.sdpottery.com/Ceramic_Misc/New_Arrivals.htm
>
> Thanks!!!!
>
> ***************************************************
> Steven D. Lee
> SD Pottery - The Little Texas Potter
> http:\\www.sdpottery.com
> millenial_age@yahoo.com
> 14341 FM 112
> Thrall, TX 76578
> 512-898-5195
> ***************************************************
>
>
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