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Liner Glazes


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#1 Kork

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Posted 10 December 2013 - 11:54 AM

Does it make any sense to use a base glaze as a liner?

I'm using a high expansion glaze with colorants.



#2 bciskepottery

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Posted 10 December 2013 - 01:20 PM

One benefit would be the liner glaze would match the COE of the exterior glaze -- promoting better/consistent glaze fit. Is it necessary to use a base glaze as the liner, no, but it may mitigate potential fit problems.

#3 Marcia Selsor

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Posted 10 December 2013 - 01:31 PM

Base glazes are just a base  without specific colorants. Liner glazes are those used for lining inside pots and as Bciske says they are made to avoid problems with COE.

 

Marcia



#4 Marcia Selsor

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Posted 10 December 2013 - 07:22 PM

I have been using liner glazes since the 60s,  before digital fire or computer programs for glazes. BTW, there wasn't much talk about toxicology back then. Barium was a favorite flux for pottery in those days because of the buttery satin surface.

 

Marcia



#5 Marcia Selsor

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Posted 11 December 2013 - 01:50 PM

Norm,

Here is a white Liner base I started using in ^6 reduction in 1980. It came from a handout from NCECA in the 70s.

I used it with a lot of different colorants in my classroom.

It works in reduction too as white. 

White Liner ^6 Reduction

Ger. Borate   20

Neph. Syenite                 30

Kaolin                              13.3

Whiting                         9.4

Talc           17.2                    

Silica                               10

Zircopax                         10

 

ADD :Pumpkin 5% Red Iron + 3% Rutile

Gold  3% Rutile

Lt. Blue  0.5% Cobalt Carb



#6 Babs

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Posted 11 December 2013 - 08:08 PM

Norm,

Here is a white Liner base I started using in ^6 reduction in 1980. It came from a handout from NCECA in the 70s.

I used it with a lot of different colorants in my classroom.

It works in reduction too as white. 

White Liner ^6 Reduction

Ger. Borate   20

Neph. Syenite                 30

Kaolin                              13.3

Whiting                         9.4

Talc           17.2                    

Silica                               10

Zircopax                         10

 

ADD :Pumpkin 5% Red Iron + 3% Rutile

Gold  3% Rutile

Lt. Blue  0.5% Cobalt Carb

Marcia is this ok in oxidation, you used the word"reduction 2x did you mean oxidation on one of these occasions?



#7 Marcia Selsor

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Posted 11 December 2013 - 09:30 PM

sorry. Yes it works in oxidation. It is richer and warmer in reduction,

 

Marcia



#8 Babs

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Posted 12 December 2013 - 05:01 AM

thanks Marcia, missing my gas kiln as I type!






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