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Firing Foreign Materials


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#1 asunta

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Posted 22 November 2013 - 08:35 AM

Long ago I made a very large carved bowl, but, instead of glazing it after the bisque firing I painted it with acrylics (o.k., just call it a "momentary lapse of reason") Now, since it sat for years, unseen by the public, but loved by me, I want to repair my mistake.  My question:  What would happen if I refired it?  To what cone # ?  Could it possibly explode or do something really damaging to my kiln?  Suggestions appreciated

Asunta



#2 Benzine

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Posted 22 November 2013 - 10:06 AM

The acrylic will burn off, and shouldn't cause a single issue, other than a little soot from the kiln as it burns off.

Years ago, as an experiment, I painted a bisque tile with acrylic. I then put a clear glaze over top and fired it. The clear trapped the acrylic in so it couldn't burn out. The image was still recognizable, but had a heavily aged appearance.

Hmmmmm....I should start experimenting more with that....
"Anything worth believing, is worth questioning"

#3 Mudslinger Ceramics

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Posted 22 November 2013 - 08:00 PM

The acrylic will burn off, and shouldn't cause a single issue, other than a little soot from the kiln as it burns off.

Years ago, as an experiment, I painted a bisque tile with acrylic. I then put a clear glaze over top and fired it. The clear trapped the acrylic in so it couldn't burn out. The image was still recognizable, but had a heavily aged appearance.

Hmmmmm....I should start experimenting more with that....

 

Yes.....tried this at college, was very curious to see what would happen

 

using acrylic and oil colours with the same basic types of oxide colours found in ceramics.....yellow ochres, red iron oxides and umbers, chrome greens, cobalt blues, cadmium reds, oranges and yellows, titanium and lead whites but could not find a cobalt based black so used carbon based blacks, half tile glazed, half tile unglazed

 

at 1000C many colours 'held on' but lost the organic lamp and bone black to smudges, at 1100C lost the cadmiums too and blues and greens faded, at 1220C earth oxides and lead white 'held on' but most everything else faded or disappeared,

 

good reminder, will try this experiement again I think!!

 

Irene


Mudslinger Ceramics :   www.mudslingerceramics.net

 

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