glazing at different temps

[druttaro 0]

I am making a bowl and want to apply glaze at cone 10 only on the inner surface, then refire it at cone 5 with underglaze for vibrant colors. Is this even possible? Will the inner glaze be damaged? Any help is welcomed!

[Marcia Selsor 1,760]

Yes it is possible but be careful that you don't shock the matured/vitrified clay on the second glaze firing. you may have a tricky time getting the ^5 glaze to stick after the ^10 firing but it is possible. You can get brighter colors at ^10 if you use encapsulated stains. That could save you the hassle of 2 glaze firings and struggling with glaze application on a vitrified body.

 

 

 

Marcia

[neilestrick 3,203]

There's also a decent chance that the cone 10 glaze will change in the cone 5 firing- color shift, glossiness change, etc. Test it first.

[druttaro 0]

Thanks for the replies.

 

I do have a test piece drying but wanted to see if it was even possible. I am not to concerned with color change to the ^10 glaze but don't want it to change texture.

 

I am doing sugar skulls so will be happiest with good color on the outside.

[bciskepottery 959]

Something to think about . . . why not use a cone 5/6 claybody, glaze fire to cone 6 and apply the underglazes for the same fire? I am assuming your underglazes are for the sprigs attached to the outside of the bowl. Save yourself time and the cost of the extra firing.

 

 

[Mark C. 3,658]

I am a cone guy-and most glazes will change somewhat when fired again to lower temp. That is a shiny glaze can become matt etc.

I am with Marcia on the cone 6 all the way body-

Testing is the only way to know any of this as you are in unchartered territory.

Mark

[druttaro 0]

I am taking a class at my university and have to use the clay available.

[Lucille Oka 21]

Why must you do this, are these the only glazes available to you?