My next round of testing intends to lock down a range of crater glazes of different colors using stains and oxides for soon application testing, as well as expanding my range of glazes to include Strontium Satin Matte Glazes, and special effect glazes such as crackles, crawls, metallics, and gloops. I’ll also be testing 2nd firing some less desirable pots with a red iron oxide wash over top. (This has been tested and is pending documentation)
CO-84
Kuan Snowflake Crackle
Cone 6-8
Nepheline Syenite | 80 |
Whiting | 5 |
Borax frit [used Frit 3134] | 15 |
Bentonite | 2 |
Apply very thickly.
Notes:
mixed at 50g water to 100g dry

- Left is 8/8/8 dip, right is 12/12/12/12/12/12 over all
CO-85
Transparent Crackle
Cone 5-8
Nepheline Syenite | 26 |
Whiting | 12 |
Lithium Carbonate | 10 |
Barium Carbonate | 3 |
Calcium Borate Frit [used Gerstley Borate] | 5 |
Silica | 44 |
Bentonite | 2 |
Apply very thickly.
Notes:
60g water to 100g dry, possibly a bit thin

CO-86
Runny Glaze
Cone 6-8
Soda Feldspar | 45 |
Silica | 17 |
Calcium Borate Frit [used Gerstley Borate] | 15 |
Whiting | 14 |
EPK | 5 |
Tix Oxide | 5 |
Bentonite | 2 |
Apply thickly.
Notes:
mixed at 70g water to 100g dry

CO-87
Bloomfield Lichen
Cone 8
Nepheline Syenite | 50 |
Light Magnesium Carbonate | 40 |
Standard Borax Frit | 10 |
Bentonite | 2 |
Notes:
300g water to 100g dry

CO-88
Katz Crawl
Cone 8-10
Nepheline Syenite | 39 |
Zinc Oxide | 19 |
Silica | 11 |
EPK | 32 |
Notes:
120g water to 100g dry, zinc didn’t dissolve well
added 2 bentonite

CO-89
Lalone Crawl
Cone 6 Oxidation
Nepheline Syenite | 70% |
Ball Clay | 5% |
Magnesium Carbonate | 25% |
Bentonite | 2% |
Notes:
200g water to 100g dry

CO-90
Lichen
Cone 6 Oxidation
F-4 Feldspar [used generic Soda Feldspar] | 30% |
Kaolin | 19% |
Magnesium Carbonate | 31% |
Talc | 8% |
Frit 3134 | 6% |
Zinc Oxide | 6% |
Notes:
added 2 bentonite
250g water to 100g dry, zinc didn’t dissolve well

CO-91
Pewter Glaze (Murfitt)
Cone 6-8
Manganese Dioxide | 77 |
EPK | 23 |
Bentonite | 2 |
Test w/ thin and thick applications.
Notes:
mixed at 100g water to 100g dry

- Tested at 3/3/3 and 8/8/8
CO-92
Bronze Glaze (Murfitt)
Cone 6-8
Manganese Dioxide | 61 |
EPK | 23 |
Copper Oxide | 8 |
Cobalt Oxide | 8 |
Bentonite | 2 |
Test w/ thin and thick applications.
Notes:
mixed at 100g water to 100g dry

- Tested at 3/3/3 and 8/8/8
CO-93
Strontium Matte Tests
- Base CO-93-1

- +2 Silica, -2% Strontium Carb CO-93-2
- Tested with 3/3/3 dip and 6/6/6 dip

- +5% Silica, -5% Strontium Carb CO-93-3
- Tested with 3/3/3 dip and 6/6/6 dip

- Without Titanium Test:
- 0.5% Cobalt Carb CO-93-4
- 1% Copper Carb CO-93-5
- 1% Chrome CO-93-6
- 6% Black Stain CO-93-7
- 15% Zirconium Stain CO-93-8
- 15% Lobster Red Stain CO-93-9
- 6% Rutile, 1% Copper CO-93-10
- 5% Titanium CO-93-10
- 5% Rutile CO-93-11









Crater Glaze Colorant Testing
Red and Yellow Stains
- Test 8% Zirconium Stain, no Titanium Dioxide CO-94-1 “Yellow Crater”

- Test 15% Zirconium Stain, no Titanium Dioxide CO-94-2 “Yellow Crater”

- Test 8% Lobster Red Stain, no Titanium Dioxide CO-95-1 “Red Crater”

- Test 15% Lobster Red Stain, no Titanium Dioxide CO-95-2 “Red Crater”

- Retest Metallic Crater 2 CO-82-1 “Metallic Crater II”

- Retest Cobalt Crater (0.5%), at 0% and 5% Titanium Dioxide CO-76-10:11 “Cobalt Crater”
- no Titanium Dioxide
- w/ 5% Titanium Dioxide


- Retest Copper Crater (1%), at 0% and 5% Titanium Dioxide CO-75-10:11 “Copper Crater”

- No Titanium Dioxide

- 5% Titanium Dioxide
- Retest Chrome Crater (1%), at 0% and 5% Titanium Dioxide CO-77-13:14 “Green Crater” (60g water to 100g dry ON ALL)

- No Titanium Dioxide

- 5% Titanium Dioxide
- Base no TiO2 - CO-72-1 “Strontium Crater”

- Retest White Crater (5% Titanium) - CO-73-1 “White Crater”

- Restest Rutile Crater (5% Rutile) - CO-78-1 “Rutile Crater

- Test 8% Best Black Stain, no Titanium Dioxide CO-95-2 “Black Crater”

- Test 14% RIO, no TiO2 CO-74-16

RIO Application Stain
CO-96
Red Iron Oxide | 50 |
Gerstley Borate | 50 |
70g water to 100g dry
Gloops
Rough Gloop
CO-97
EPK | 33.4 |
Silica | 32.4 |
Frit 3124 | 30.8 |
Whiting | 3.4 |
Bentonite | 2 |

Glossy Gloop
CO-98
Silica | 32.8 |
EPK | 27.3 |
Frit 3134 | 18.6 |
Minspar 200 [substituted for a general soda feldspar] | 13.5 |
Whiting | 7.7 |
Bentonite | 2 |

- Add 40% [Added 60% instead] water by weight, blend, then dry on plaster into paste for both
No stains for now
CO-62-1
Easy E Clear
Cone 6 Oxidation
Nepheline Syenite | 20% |
Silica | 25% |
Wollastonite | 20% |
Kaolin | 15% |
Frit 3124 | 20% |
Bentonite | 2% |
The best cone 6 clear that I’ve tested. Seems to be fine, thick or thin. No crazing, no dripping, no pin holing, and no dripping.
Mixed at 70g water to 100g dry

Testing 4/4:
- Gloop colorants
- Thick thick crackle application
- Retest bronze multiple areas of kiln
- Application test crater glazes
Glossy Gloop Colorant Tests
- CO-98-1 (retest white for control)

- CO-98-2 (5% Mason 6600 “Best Black”)

- CO-98-3 (5% Mason 6026 “Lobster Red”)

- CO-98-4 (5% Mason 6450 “Praseodymium”)

- CO-98-5 (5% Mason 6313 “Medium Blue”)

- CO-98-6 (5% Mason 6263 “Victoria”)

- CO-98-7 (5% Mason 6023 “Clover Pink)

- CO-98-8 Purple 8% - have in small bag, test next time

- CO-98-9 (5% Mason 6129 “Gold Ambrosia”)

For next round of testing:
- Colored slips
- Colored Crawls [DONE]
- CMW Pick-A-Part
- Test known crater colorant combinations with other base recipes
CO-99-1
Colored Slip
Cone 5 Oxidation
- Using Highwater Helios as base
- Currently drying out
- Base
- +8% Mason 6313 “Medium Blue”
- +8% Mason 6450 “Praseodymium”
- +8% 5% Mason 6026 “Lobster Red”
Yehrim’s Cone 06 Gloop
CO-100-1
Cone 06
Whiting | 17.9 |
Ferro Frit 3124 | 25.8 |
Nepheline Syenite | 14.8 |
EPK | 12.2 |
Silica | 29.3 |
- Tested as a paste at 40% applied with brush and spatula, and as a solid after drying out, but had to re-add some of the paste because it was too dry after being put on plaster pretty much immediately
- Tested at 40% water to dry
Lalone Crawl
CO-89 Stain Tests
Test with 50g dry samples to 100g water
- CO-89-1 Base

- CO-89-2 (5% Mason 6600 “Best Black”)

- CO-89-3 (8% Mason 6026 “Lobster Red”)

- CO-89-4 (8% Mason 6450 “Praseodymium”)

- CO-89-5 (3% Mason 6313 “Medium Blue”)

- CO-89-6 (8% Mason 6263 “Victoria”)

- CO-89-7 (10% Mason 6023 “Clover Pink)

- CO-89-8 (8% Mason 6385 Pansy Purple)

Retesting some Gloops
- CO-98-3 (dripped in)
- CO-98-9 (dripped in)
- CO-98-2 (dripped in)
- CO-98-6 (dripped in)
- CO-98-8 (Purple Stain)
CMW Pick-A-Part
- H-1-1
CO-101
-1: White (Base)
/image
Underglaze tests
CO-102
-1: 33%
-2 16.5%
-3 8.25%