Randy McCall on thu 16 nov 06
I tried the following glaze and got a very nice black with sort of a teadust
effect. I would like to increase the gold flecs. I assume this came from
the manganese. Do I just need to increase the manganese to increase the
flecs? (I am aware of the manganese problem)
Recipe Name: CHAPPELLS FLOATING BLACK
Cone: 6 Color: BLUE
Firing: Surface: Glossy
Amount Ingredient
47.3 Nepheline Syenite
27 Gerstley Borate--1999
20.3 Silica
5.4 Kaolin--EPK
100 Total
Additives
2 Rutile
1.5 Cobalt Carbonate
4 Iron Oxide--Red
2 Manganese Dioxide
Unity Oxide
418 Na2O
112 K2O
006 MgO
464 CaO
1.000 Total
702 Al2O3
476 B2O3
002 Fe2O3
4.553 SiO2
001 TiO2
0 P2O5
6.5 Ratio
7.3 Exp
Comments: Good smooth BLACK with tints of blue and gold flecs. Very nice.
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Calculations by GlazeMasterT
www.masteringglazes.com
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Randy
South Carolina
Pottery Web site
http://members.tripod.com/~McCallJ/index.html
Steve Slatin on fri 17 nov 06
Randy -- There's a good chance that the recipe you gave gets its
gold flecks from the rutile. An easy test for the manganese vs.
rutile theory would be to glaze a small sample piece in the glaze,
and paint a stripe or whatever (personally, I'd use the letters
M and R myself, but I'm very simplistic about tests) in a thin
solution of rutile and water and manganese and water. That'll
show you which additional material will give you the effect.
I'd like to know what the results of your glaze development are!
Best wishes -- Steve S
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I tried the following glaze and got a very nice black with sort of a teadust
effect. I would like to increase the gold flecs. I assume this came from
the manganese. Do I just need to increase the manganese to increase the
flecs? (I am aware of the manganese problem)
Recipe Name: CHAPPELLS FLOATING BLACK
Steve Slatin --
They grew and grew up the old church wall
Till they could growe no higher
They lapped and tyed in a true love knot
The rose wrapped ‘round the briar”
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Randy McCall on thu 30 nov 06
Steve I will post the results probably early next month.
Randy
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