Jump to content
Sign in to follow this  
wenders

Give Me More Crackle!

Recommended Posts

My fellow rakuteers and I have been having inconsisent results with a long-trusted white crackle glaze, whether on a cone 6 white stoneware or a classic grog rakuware. I think the problem is primarily the glaze temperature (we usually (electric) bisque to 08), and always aim for 1000C degrees in our propane kiln, having achieved some fantastic crackles, mattes, and lustres. In all the material I've seen for raku glaze recipes and reduction techniques, I've rarely seen anything about temperature for glossy v. matte. I seem to recall one workshop where we were told to fire the crackle-glazed ware farthest from the flame and/or to a slighty lower temp. While I thrill at the unpredictability of raku, there's a certain level of stability that would be equally thrilling! Any suggestions?!?

Share this post


Link to post
Share on other sites

Are you looking for more crackle or are you trying to find a matte?

 

I fired white crackle glaze by sight ... When it looks like water melting on ice it is ready to pull.

Not very scientific.

 

Then hold it in the air until you hear the first ping.

Then cover for reduction.

Share this post


Link to post
Share on other sites

My fellow rakuteers and I have been having inconsisent results with a long-trusted white crackle glaze, whether on a cone 6 white stoneware or a classic grog rakuware. I think the problem is primarily the glaze temperature (we usually (electric) bisque to 08), and always aim for 1000C degrees in our propane kiln, having achieved some fantastic crackles, mattes, and lustres. In all the material I've seen for raku glaze recipes and reduction techniques, I've rarely seen anything about temperature for glossy v. matte. I seem to recall one workshop where we were told to fire the crackle-glazed ware farthest from the flame and/or to a slighty lower temp. While I thrill at the unpredictability of raku, there's a certain level of stability that would be equally thrilling! Any suggestions?!?

 

Share this post


Link to post
Share on other sites

I second the eyeball method. The glaze should look like sun reflecting off water melted on top of an icy pond. If you are reducing in paper or sawdust are you leaving it in there too long? I get better cracks if I plunge into water after about 15 min in reduction. The amount of cracking also relates to the glaze fit. Post the recipe, there may be clues.

Share this post


Link to post
Share on other sites

My fellow rakuteers and I have been having inconsisent results with a long-trusted white crackle glaze, whether on a cone 6 white stoneware or a classic grog rakuware. I think the problem is primarily the glaze temperature (we usually (electric) bisque to 08), and always aim for 1000C degrees in our propane kiln, having achieved some fantastic crackles, mattes, and lustres. In all the material I've seen for raku glaze recipes and reduction techniques, I've rarely seen anything about temperature for glossy v. matte. I seem to recall one workshop where we were told to fire the crackle-glazed ware farthest from the flame and/or to a slighty lower temp. While I thrill at the unpredictability of raku, there's a certain level of stability that would be equally thrilling! Any suggestions?!?

 

 

I agree with Chris, fire by eye until you get to know the glaze. Wave it around in the air or even have someone squirt it with water before smoking it. The shock causes the crackles.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×