Cone 6 spoons and Val's Turquoise two ways

 

Val's Turquoise two ways - bowls and spoons, clockwise from top left selsor chun, ashley's best, cesco clear.

I haven't done anything for a while, so to get going again with glazes I dipped some of the spoons I've been making recently into existing glazes and mixed two versions of a new one - Val's Turquoise.

This time I bisque fired the spoons only to cone 04 - 1046ish as I read somewhere that they take the glaze better. Older bisque went to cone 05 or higher 1080C.

Remixed all old Cone 6 glazes lots and checked Specific Gravity.

Recorded the Spec Grav in Glaze book.

Arrowmont Blue Green ran badly and crazed a lot when it came out of the kiln. Pinged a lot. Good in bowl but crazed.

Fix this somehow? My version very glossy compared to online.

VC Matte yellow ran too. Good in bowl. Didn't craze.

Maybe they both need to be deflocculated?

Ashleys best was good. Very thick for spoons though prefer translucent.

I wrote out the recipe each time without Eckalite but I'm sure it must have gone in because the glaze worked?

Selsor Chun was great. Use again. See that some people add copper carb to bring up the blue. Test?

Val's Turquoise was well behaved. The lighter colour is better but could still be lighter. Its a bit flat.

Val's Turquoise bowls and spoons both %, clockwise from top left selsor chun, ashley's best, cesco clear.

selsor chun, clear cesco midfire paint on, val's turquoise 3% on spoon 1.5% on owl, bowl in VC Matte Yellow.

Cone 6 Glazes

Testing some cone 6 glazes from John Britt's Mid-Range Glazes and online resources

GREENS and BLUES

Alicia Clausen's Turquoise Matte 'The One'
 Nepheline Syenite 60
 Strontium Carbonate 25
 Silica 9
 EPK 4
 Lithium Carbonate 2
 

Copper Carbonate 3.5
 Bentonite 4
 Epsom Salts 1

Chun Seafoam
Soda Feldspar 41
Silica 27
Whiting 15
Eckalite 5
Zinc Oxide 12

Copper Carbonate 5
Titanium Dioxide 5
Bentonite 2

Pinnell Seafoam
Soda Feldspar 51.3
Strontium carbonate 25.5 

EPK 13.6
Frit 3134 9.6

Copper Carbonate 5
Titanium Dioxide 5

Pinnell's Strontium Matte 
Nepheline Syenite 57
Silica 8.6 

Ball Clay 9.5
Strontium Carbonate 19
Lithium Carbonate 5.9

Copper Carbonate 5
Titanium Dioxide 5
Bentonite 2

Arrowmont Blue Green 
Nepheline Syenite 44.6
Silica 13.3 Whiting 11.1
Eckalite 13.3
Gerstley Borate 11.1
Lithium Carbonate 6.6
Titanium Dioxide 6.2

Cobalt Carbonate 1
Bentonite 2

LIGHT BLUE

Selsor Chun
Soda Feldspar 34
Silica 30
Whiting 10
Dolomite 6
Frit 3134 17
Zinc Oxide 3
Tin Oxide 1

Red Iron Oxide 0.5-2
Bentonite 2

PURPLE

Ashley’s Best (purple)
Nepheline Syenite 27.2
Silica 25.3
Dolomite 16.2

Eckalite 13.3

Talc 11.4
Lithium Carbonate 6.6

Cobalt carbonate 2-4
Bentonite 2

CRAWL

Lalone Crawl
Neph Syenite 70 

Ball Clay 5
Magnesium Carbonate 25

YELLOW

V.C. Matte (Yellow) 
Nepheline Syenite 44.4
Silica 15.6 

 Whiting 8.9
Eckalite 11.1
Gerstley Borate 11.1
Lithium Carbonate 8.9

Rutile 4
Titanium Dioxide 6-10
Bentonite 2

HP Stoneware results

14 Pine Street
Colour variations

Mixed up 200gms Base Glaze and divided it into four batches.
Added these colourants
1 - 0.375% Cobalt Carbonate, 6% rutile
2 - 0.25% Cobalt Carbonate, 3.5% Titanium dioxide, 2.25% Copper Carbonate
3 - 0.25% Cobalt Carbonate, 2.25% Copper Carbonate
4 - 0.25% Cobalt Carbonate, 3% Red Iron Oxide

Cone 6 colour tests

Date: 9 April 2018
Clay: Keanes Stoneware 7

Following on from last week's Cone 6 tests. Adding different colour oxides in 50-50 mixture for HP and four different colour tests for 14Pine.

HP 
Colour tests 50:50 grid

Mixed up 250gms of Base Glaze and then divided it volumetrically into 5 equal batches.
Started the five test pots with double strength as they will be diluted by 50% when combined with another pot.

Added colourants as below:
A - 3% Copper Carbonate
B - 2% Cobalt Carbonate
C - 6% Red Iron Oxide
D - 12% Rutile flour
E - 8% Titanium Dioxide



14 Pine Street
Colour variations

Mixed up 200gms Base Glaze and divided it into four batches.
Added these colourants
1 - 0.375% Cobalt Carbonate, 6% rutile
2 - 0.25% Cobalt Carbonate, 3.5% Titanium dioxide, 2.25% Copper Carbonate
3 - 0.25% Cobalt Carbonate, 2.25% Copper Carbonate
4 - 0.25% Cobalt Carbonate, 3% Red Iron Oxide

Cone 6 tests

Three tests in recently fixed kiln.

Date: 7th March 2018
Clay: Keane's Stoneware 7

Hopeful Potter Matte

40      Potash Feldspar
20      Whiting
25      Eckalite (China Clay)
15      Silica

John Post Calcium Matte [JP. JPSM]

30.2    Ball Clay FX (Kentucky OM)
5.7      Frit 3134
32.5    Nepheline Syenite
16.3    Wollastonite
4.9      Whiting
10.4    Silica (Flint)

14 Pine
4.03     Frit 3124
28.20   Potash Feldspar
16.11   Whiting
19.17   Eckalite
32.50   Silica


Love them all.
Surprised JP wasn't more matte.
HP is lovely, read later its for ^8? Seems okay though, I"m going to perservere.
14 is taken from my Currie grid test at Pine Street. Initially I'd chosen another square but later it crazed so I went with another mix that hadn't.

Now to test with colour!

Earthenware tests 18/2

Out of the kiln this morning a number of Earthenware cone 04 glaze tests.
I'm still just trying to find successful base glazes, retesting some of the recipes I've tried before to make a base line for revisions.

All were fired to 1080 degrees Celcius on Keanes Earthenware tiles bisque fired to cone 04.

Worthington Clear 
EW cone 04

Gerstley borate     55%
Eckalite                30
Silica                    15

Results
Very clear glaze, some bubbles in suspension in thickest parts.




ABEM 
cone 04

Frit 3124               50
Eckalite                15.65
Whiting                16.65
Silica                    17.75
Total                            5

Results
Nice smooth matte glaze

EB* 
clear EW, cone 04

Frit 4131              83.3
Eckalite               16.6
* batches 2 and 3 combined and whizzed up to be smoother

Results
This seems quite matte even though its a clear recipe. Much better results from first try when I must have put incorrect amounts in. Whizzed up. Need to buy a sieve.




Julie's Satin
cone 04

Whiting                   17
Gerstley borate        27
Lithium carbonate     6
Nepheline syenite      4
Eckalite                    12
Silica                        34

Results
This glaze is still cracking. Which is a pity because I like the quality of its matte surface.
Will maybe try to modify it though I have tried before with no improvement.





Satin Base SB

Results
This is the old batch remixed. The white version of this has a tendency to late crazing which is a pity because I really like the creamy surface of this.

Earthenware tests 10/2/18

AB Clear glaze Frit Eckalite LB revised to use Strontium carbonate LB revised to use Whiting