Tuesday, June 2, 2015

Crater Test Series

Here are some Crater Glaze Tests with stains.

The recipe is Pinnell Strontium Matte at cone 6 E1 firing


60 Nepheline Syenite

20 Strontium Carbonate

1 Lithium Carbonate

10 Ball Clay–Old Mine #4

9 Silica

100 Total


Additives

5 Titanium Dioxide
2.5 %  Silicon Carbide 600 M

Apply VERY thick. And you can add up to 5% silicon carbide. You can also vary the amount of stains. See page 178 in The Complete Guide to Mid-Range Glazes for more recipes and firing information. Electric E1 cycle. This can vary too!!








This last one is Mason 6433 at 5%, 10%, 15%, 20%, and 25%

9 comments:

Linda Starr said...

love the first one with the lavender color, one of my favorite colors, craters on the others are nice too.

Isabelle Demers said...

Hi! Did you know some low fire crater glaze?

John Britt said...

You can just try matte low fire glaze....I can look tomorrow.

John Britt said...

You can just try matte low fire glaze....I can look tomorrow.

John Britt said...

Here is one:

http://ceramicartsdaily.org/ceramic-glaze-recipes/low-fire-glaze-recipes/top-crater-glaze-recipe-cone-08-04-oxidation/

Mary Farmdale said...

Struggling with crater effect, anyone have a firing schedule they can share?

John Britt said...

I use E1 from my book on midrange glazes, which is just fast fire. (you don't want slow fire because all the silicon carbide will burn up. You want to catch it burning up and leaving bubbles. It is basically 200 F per hour to 200 F, hold 15 minutes to dry glazes, then 500 F per hour to 1978 then 150 per hour to 2225 F.

John Britt said...

There is a good Facebook Group you may like:

https://www.facebook.com/groups/653663804761760/?ref=bookmarks

Mary Farmdale said...

Just ordered your book. Yay!
so one last question, if you dont mind….

---do slow ramp down between 1900 and 1500 for a matt effect? (Am working with Steve’s Strontium C6 glaze from Lana Wilson’s book.)

Have been successful in getting a cratered look by heavily texturing the pot when throwing and not quite covering everybody up.

Feels a bit like a cheat though. Hence this new path down crater glazes.