Monday, January 10, 2011

18 Glazes!

Wow!
I'm spending January working on developing a glaze palette that is consistent and feels like my voice.
I almost feel like when I have it nailed down, I may shift my form a bit to follow it.
Bass-ackwards I'm sure.

I have about 4 good, consistent glazes now - a crystaline gold, a lovely Tenmoku, an iron red and both a glossy and matte white.
I just want a little somethin' somethin' in there too.
Anyway, this test was 18 different glazes, at cone 10 reduction.
Everything was single-fired, and the kiln was held at 500f  and 1800f each, for one hour. Reduction was started after the 1800f soak and carried out to cone 10/11. The kiln was then slowly cooled of about an hour to 2000f and then shut off.
Each glaze was applied to 4 tiles (in the order they'll appear in the photos):

  1. over both Red Iron Oxide and Rutile washes
  2. 1/2/3 dip on white stoneware
  3. 1/2/3 dip on iron rich stoneware
  4. over iron red (Ohata) glaze.
Unless otherwise indicated, all glazes started with the following base
 (from "the Potter's Palette" by Constant and Ogden):
  • Potash Feldspar                  50
  • Dolomite                             20
  • EPK                                   20
  • Bone Ash                           10
Click on any image to see it full size.
As always, comments and input are greatly appreciated!

Glaze #1a

Base Glaze plus 1.5% copper oxide.




Glaze #1b

Base Glaze plus copper oxide 1.5% and rutile 5%



Glaze #1c

Base Glaze plus copper oxide 1.5% and tin oxide 5%



Glaze #2a

Base Glaze plus cobalt oxide 1%



Glaze #2b

Base Glaze plus cobalt oxide 1% and vanadium pentoxide 3%



Glaze #2c

Base Glaze plus cobalt oxide 1% and tin oxide 5%



Glaze #3a

Base Glaze plus rutile 15%



glaze #3b

Base Glaze plus rutile 15% and chrome oxide .25%


Glaze #3c

Base Glaze plus rutile 15% and tin oxide 5%



Glaze #4a

Base Glaze plus vanadium pentoxide 6%



Glaze #4b

Base Glaze plus vanadium pentoxide 6% and red iron oxide 3%



Glaze #4c

Base Glaze plus vanadium pentoxide 6% and rutile 5%



Fire Yellow Redux

From ClayUtah forums.

Custer Feldspar           50
EPK                           50
Dolomite                     25
Whiting                       10
Tin Oxide                     5.5
Bone Ash                     8
Red Iron Oxide            1
Rutile                           2




Blindingly Bright Green

(from ClayUtah forums)
Oh dear - this is just so wrong. Looked so good in the pic too! But I see I left out one ingredient, so I'll try it again...

Ball Clay                                     10
Whiting (accidentally omitted)      20
Silica                                           20
Custer Feldspar                          40
Copper Carbonate                       .5
Chrome Oxide                             2




Choy Celedon

(from John Britt's "The Complete Guide to High Fire Glaze")

Custer Feldspar                 50
Silica                                 28
Whiting                               6
EPK                                   4
Barium Carbonate             12
Red Iron Oxide                   2



Barnard Slip


Barnard Slip        80
EPK                   10
Rutile                  10











Shaner Oribe

(From John Britt's "The Complete Guide to High Fire Glaze" )

Custer Feldspar          31
Whiting                      22.1
Silica                          25.3
EPK                          12.6
Talc                             7.9
Bone Ash                     1.1
Copper Carbonate       5.2




John's Red

(from John Britt's "The Complete Guide to High Fire Glaze")
Not sure what happened here, except it called for frit 3134 and I only had 3124.

Custer Feldspar     48.2
Whiting                  13.6
Silica                     15.5
EPK                       5.5
Frit 3134
(subbed 3124)        9.1
Talc                        3.6
Zinc oxide               4.5
Tin oxide                 1.2
Copper Carbonate     .8
Bentonite                   1



Well, there ya go. Some complete failures, but some really exciting possibilities too!
Next week, I'll be testing the same glazes, and maybe a few more, in an oxidation firing.
Stay tuned...
CMCK

5 comments:

cmonk82 said...

Some very nice colors!

John Britt said...

Nice job! Watch out you may get hooked!

(I wrote "The Complete Guide to High Fire Glaze", while John and Ron wrote "Mastering Cone 6", I think you kinda smashed them together?!)

chaetoons said...

Thanks for sharing !!!
Hugs
Chae

the Square Peg said...

Oh shoot John - so sorry! Gonna go correct that right now!

Birgit's Pots said...

An amazing amount of work, Some great results, I'll be interested to know which ones you decide to persue, I've never tryed Vanadium, I'll have to look it up. cheers, Birgit

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