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Coloured Slip Onto Glazed Piece ?


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#1 eoteceramics

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Posted 28 September 2013 - 02:52 AM

Hi, quick question

 

Is it possible to use coloured slip over a glazed and fired piece? I missed a bit the first time around. Thanks

 



#2 Benzine

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Posted 28 September 2013 - 08:00 AM

I'm not going to pretend to be an expert, as I've only used a limited amount of products, but from my experience you do not use colored slips/ underglaze over glaze.

 

The results I have seen, cause the underglaze to look "foamy", and generally look terrible. 

 

Of course, if you used a low fire underglaze, it would melt at high fire temperatures, so in that case it might work.


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#3 Venicemud

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Posted 30 September 2013 - 01:15 PM

I imagine it would depend upon the slip composition.  I have used commercial and home mixed underglazes on fired pieces successfully - the trick is getting the underglaze to stay by coating the piece with dilute Elmer's glue or by warming - and refiring to the original glaze temperature (cone 6 in my case).  If the slip is all or almost all clay I would not expect it to work, but some slips approach being underglazes in their composition, with feldspars and fluxes added.

 

I have recently taken up on-glaze painting (china painting) and find this a much quicker and easier way of recovering from booboos.



#4 oldlady

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Posted 30 September 2013 - 06:26 PM

how was the slip made?  is it simply wet clay with color added or is it a formula with several ingredients?  

 

i know that you cannot do what you want if it is just wet clay with color.  

 

where did you get the slip?  lots more info would help.


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#5 neilestrick

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Posted 01 October 2013 - 08:26 AM

Slip is clay, and so it must follow the same rules of attachment as any other clay- nothing harder than leather hard. If you trail slip onto glaze fired, bisqued, or bone dry work, it will flake off as it dries. Underglazes are a completely different animal, and are formulated to work on leather hard, bone dry or bisque. They may very well work on glazed pots, too.


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