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timbo_heff

Member Since 24 Apr 2012
Offline Last Active Yesterday, 12:55 PM
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Topics I've Started

Metallic Weirdness On Pots

29 May 2014 - 01:07 PM

 Here's a strange result:

Used some old pieces of angle iron as grate bars in wood fire (cone 11+)

When opening the kiln there was some strange blue green stuff in the ashes left behind;

Unfortunately the stuff got on pots too:

It seemed to react especially terribly with an iron celadon (Mark's tenmoku with 2% iron)

but also made ugly stuff on shino and even unglazed wares.

 

Wondering if any one has seen problems from rusty metal in a kiln before:

The iron came from an old railroad bridge (1940's maybe)

The bars were rusty on the surface but still dense and heavy.

After the firing it was flaking in big chunks.

 

Could the problem be from just the iron?

I am thinking that some other impurity in the metal vaporized.

Perhaps the iron was poorly smelted in the first place and was giving off something like whatever is in the blue slag you find around old iron processing furnaces ?

 

Www 2
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Great Video On African Forming And Firing : Wow!

15 February 2014 - 06:06 AM

Worth a watch !
 
http://youtu.be/52HKSwkI1hs

Flooded Glaze Bucket

28 October 2013 - 01:01 PM

So a bucket of Tenmoku I had outside took on some rain water.

The bucket had not moved in many months. Crystal clear water floating on top of the settled glaze materials.

I poured off the excessive water:

 

Did that change the glaze: ie are there chemical components in the water that never settle out that I have now just poured off ?

 

Thanks!