Randy McCall on sun 16 dec 07
I have a glaze that I would like to brighten the blue. I want it to really
jump out at you, but not really change the color or the transparency of the
glaze. It turns out a nice blue jean blue right now using Chappell's
Floating Blue base.
I was thinking about adding some zinc or bone ash. I just don't want to
sacrifice the opacity of the glaze.
Can someone give me some suggestions?
Recipe Name: CHAPPELLS FLOATING BLUE without Iron
Cone: 6 Color: BLUE
Firing: Oxidation Surface: Glossy
Amount Ingredient
47.3 Nepheline Syenite
27 Gerstley Borate--1999
20.3 Silica
5.4 Kaolin--EPK
100 Total
Additives
6 Rutile
1 Cobalt Carbonate
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: FLOATING BLUE WITHOUT IRON 2 MORE % RUTILE
-----------------------------------
Calculations by GlazeMasterT
www.masteringglazes.com
------------------------------------
Randy
South Carolina
Pottery Web site
http://members.tripod.com/~McCallJ/index.html
June Perry on sun 16 dec 07
Rutile and iron have always been used as color modifiers in blue glazes
(they quiet the intense noxzema blue that cobalt alone can give you), so you
might lower the rutile to 1-2% and leave the cobalt the same. You can also do
another version with the lowered rutile, but up the cobalt to 1.25-1.5%
There is no shortage of Cone 6 blue glaze recipes out there, so you might
want to check the clayart archives for some of those recipes.
Regards,
June
_http://www.shambhalapottery.com_ (http://www.shambhalapottery.com/)
_http://shambhalapottery.blogspot.com_
(http://shambhalapottery.blogspot.com/)
_http://groups.yahoo.com/group/sodasaltfiring_
(http://groups.yahoo.com/group/sodasaltfiring)
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Randy McCall on sun 16 dec 07
June thanks,,,,,,,your suggestion sounds good.
Randy
South Carolina
Pottery Web site
http://members.tripod.com/~McCallJ/index.html
May Luk on sun 16 dec 07
Hello Randy;
Further to June's suggestion, you might want to try adding 1 part copper oxide your colorants. Either 0.5 copper oxide (or copper carb) and 0.5 cobalt carb or 1 % copper oxide plus 1% cobalt carb. This will lighten the blue from an indigo blue to a medium cobalt blue. While you are at it, you can first test one extra tile with 1% copper oxide before you add the cobalt. Copper oxide in this glaze formulation should be a turq blue and you might like that too.
Zinc is a let down and it would dull your glaze color. As far as I know, bone ash is usually an ingredient for cone 8+ glaze.
Regards
May
Kings County
Michael Wendt on mon 17 dec 07
Randy,
You don't say what clay you are using.
A key factor in glaze brightness is the
color of the body, so if your body is
off white or tending to brown, slip
coating the area where you want the blue
color to show brighter with a white clay
slip in the greenware state can improve
color response drastically. That's the
main reason I fire Helmer oxidation.
In oxidation, our color response is bright
and matches previous set work better.
Regards,
Michael Wendt
Wendt Pottery
2729 Clearwater Ave.
Lewiston, Id 83501
U.S.A.
208-746-3724
wendtpot@lewiston.com
http://www.wendtpottery.com
http://UniquePorcelainDesigns.com
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