Bubble Bubble Toil And Trouble

[High Bridge Pottery]

The coloured graphs are from some presentation about glass - http://www.lehigh.edu/imi/teched/GlassProcess/Lectures/Lecture02_Hubert_Melting%20and%20fining%20processes.pdf

 

The other is from here - https://www.irsm.cas.cz/materialy/cs_content/1999/Beerkens_CS_1999_0000.pdf

 

No pictures from these

- http://www.pnl.gov/main/publications/external/technical_reports/PNNL-15175.pdf

-  https://www.irsm.cas.cz/materialy/cs_content/2006/Klouzek_CS_2006_0000.pdf

 

I remember reading somewhere about firing hot and glazing lower with stoneware but I have no idea where that was now so can't confirm much. Don't know the reason for it either. It's my understanding that they are not actually firing in a reduction atmosphere but adding carbon to the batch and calling it reduced. Half the carbon is lost as CO2 but it seems they want a reaction with the carbon and sulphate. This made me remember something I read about reduction and that it's the carbon produced by the sooty flame that's doing the reducing not so much the lack of oxygen.

 

There was some talk about the refractory in the glass kilns and how they can produce bubbles although it seemed to more be releasing the trapped gas already in IFB. I have been trying to think of ideas so I can rule out the clay body, It's my assumption that it's not really doing anything bubbly. The two ideas are; fire glaze direct onto bits of kiln shelf or hard brick and see if there's any difference. Not sure if that rules out gas from clay/glaze boundary but would maybe rule out something.

[Magnolia Mud Research]

Thanks for the sources Joel.

 

I will read them this weekend and go from there.

 

LT