Alisa og Claus Clausen on sun 10 feb 02
Glaze test for: Ron Roy Black, 3 versions, cone 6 ox.
Source: Frogpond Pottery
Credited to: Ron Roy
All tests fired on white, iron flecked, mid-range stoneware.
Fired to cone 6 (1220c) in oxidation.
Firing ramp:
100c (212f) per hour to 600c (1112f)
150c (302f) per hour to 1100c (2012f)
100c per hour to 1220c (2228f)
15 - 30 minute soak depending on matts and glosses used.
cool down 100c per hour to 900c.
Natural cool down to 150c (approximately 15 hours)
Recipe:
Ron Roy Black #3
22 Custer Spar
4 Whiting
5 Talc
26 Frit 3134
17 EPK
26 Flint
ADD
2 Bentonite
9 RIO
1 Cobalt Carbonate
Note:
All raw materials measured up or down to nearest whole decimal.
Oxides used on percent basis to a 100 gram batch of glaze.
Substitutions:
Forshammer Spar for Custer
Local Frit for 3134
Resulted in:
Very smooth and glossy black glaze. Where thickest, very black, where
thinner to thinnest, a dark brown.
In the crevices of the tile where the glaze could pool, it is streaked with
blue.
Ron Roy Black #3 V.1
Recipe same as above except
ADD
2 Cobalt Carbonate (instead of 1)
Resulted in:
A more uniform black with same smooth surface. Personally I would use this
glaze with 2% Cobalt carbonate instead of 1%.
Ron Roy Black #2
Recipe
21 F4 Kona Spar
6 Whiting
3 Talc
26 Frit
17 EPK
27 Flint
ADD
2 Bentonite
9 RIO
1 Cobalt Carb.
Resulted in:
Also a very glossy black, but slightly more lush and covering than the two
above. Where it pooled in the crevices of the tiles it has a very tiny
bluish streaks, but not as markedly as Ron Roy Black #2.
Regards from Alisa in Denmark
SusanRaku@AOL.COM on mon 11 feb 02
In a message dated 2/10/2002 3:19:07 PM Eastern Standard Time,
aliskin@MAIL.DK writes:
> Subj: Glaze test for Ron Roy Black, 3 versions, cone 6, ox.
> Date: 2/10/2002 3:19:07 PM Eastern Standard Time
> From: aliskin@MAIL.DK (Alisa og Claus Clausen)
> Sender: CLAYART@LSV.CERAMICS.ORG (Ceramic Arts Discussion List)
> Reply-to: CLAYART@LSV.CERAMICS.ORG (Ceramic Arts Discussion List)
> To: CLAYART@LSV.CERAMICS.ORG
>
>
>
>
> Glaze test for: Ron Roy Black, 3 versions, cone 6 ox.
>
> Source: Frogpond Pottery
> Credited to: Ron Roy
>
> All tests fired on white, iron flecked, mid-range stoneware.
> Fired to cone 6 (1220c) in oxidation.
>
> Firing ramp:
> 100c (212f) per hour to 600c (1112f)
> 150c (302f) per hour to 1100c (2012f)
> 100c per hour to 1220c (2228f)
> 15 - 30 minute soak depending on matts and glosses used.
> cool down 100c per hour to 900c.
> Natural cool down to 150c (approximately 15 hours)
>
> Recipe:
> Ron Roy Black #3
>
> 22 Custer Spar
> 4 Whiting
> 5 Talc
> 26 Frit 3134
> 17 EPK
> 26 Flint
>
> ADD
> 2 Bentonite
> 9 RIO
> 1 Cobalt Carbonate
>
>
> Note:
> All raw materials measured up or down to nearest whole decimal.
> Oxides used on percent basis to a 100 gram batch of glaze.
>
> Substitutions:
> Forshammer Spar for Custer
> Local Frit for 3134
>
> Resulted in:
> Very smooth and glossy black glaze. Where thickest, very black, where
> thinner to thinnest, a dark brown.
> In the crevices of the tile where the glaze could pool, it is streaked with
> blue.
>
> Ron Roy Black #3 V.1
>
> Recipe same as above except
> ADD
> 2 Cobalt Carbonate (instead of 1)
>
> Resulted in:
> A more uniform black with same smooth surface. Personally I would use this
> glaze with 2% Cobalt carbonate instead of 1%.
>
>
> Ron Roy Black #2
> Recipe
> 21 F4 Kona Spar
> 6 Whiting
> 3 Talc
> 26 Frit
> 17 EPK
> 27 Flint
>
> ADD
> 2 Bentonite
> 9 RIO
> 1 Cobalt Carb.
>
> Resulted in:
> Also a very glossy black, but slightly more lush and covering than the two
> above. Where it pooled in the crevices of the tiles it has a very tiny
> bluish streaks, but not as markedly as Ron Roy Black #2.
>
> Regards from Alisa in Denmark
>
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