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saggar firing


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#1 naghmeh

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Posted 08 September 2012 - 05:43 AM

hi guys
i'm in a problem.... i did saggar in 995c... but unfortunately i don't know why my works got no color. i put Chromium oxide, Cobalt oxide, copper oxide and copper sulfate at the saggar bottom.
but there wasn't any color on my works.... please help me?

#2 Marcia Selsor

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Posted 08 September 2012 - 11:29 AM

did you use any salt, sawdust and wood bits?
the salt help volitalize the oxides. I use mostly copper carbonate and salt. I also use copper nitrate that I get from the nursery supplies. it is a root killer but will blush well in a sagger. I put wood stick, newspaper and sawdust then put the coppers carb. And salt on the top. people berg has a good video on firing staggers and puts layers when he uses a garbage can for a saggar. Linda and Charlie Riggs use individual saggars per piece. They fire to 1600 F. And hold for 20 minutes. I don't know which method you were using. I have done both methods but always use saly and the oxide together in the layers.

Marcia

#3 neilestrick

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Posted 08 September 2012 - 11:33 AM

Describe your saggar. How closed up was it? How big? How tightly packed? What combustible?
Neil Estrick
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#4 Marcia Selsor

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Posted 08 September 2012 - 11:40 AM

did you use any salt, sawdust and wood bits?
the salt help volitalize the oxides. I use mostly copper carbonate and salt. I also use copper nitrate that I get from the nursery supplies. it is a root killer but will blush well in a saggar.
Robert Peipenberg Has a good video for firing a garbage can or oil drum saggar. he layers wood, newspaper, sawdust salt and oxides. India and Charlie Riggs use individual saggaars per piece. THey fire to 1600 F. And hold for 20 minutes. I have used both methods. I am not sure which method you are using or if you had any combustibles or salt with the oxides. Please be a little more specific with what you were doing.
.
Marcia

#5 naghmeh

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Posted 09 September 2012 - 06:00 AM

my saggar is a vase 40cm hight and 3ocm diameter, 2cm thickness..... i lay oxides at the bottom and set my works and put sawdust between them, i didn't use salt...
do i use salt top of saggar????
do i put oxides in the special place or i can pour at the bottom of saggar and top of the works?????
do i hold in temperature?
if the cap of saggar is not closed correctly, may it cause any problem????
thank you

#6 Marcia Selsor

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Posted 09 September 2012 - 06:35 PM

my saggar is a vase 40cm hight and 3ocm diameter, 2cm thickness..... i lay oxides at the bottom and set my works and put sawdust between them, i didn't use salt...
do i use salt top of saggar????
do i put oxides in the special place or i can pour at the bottom of saggar and top of the works?????
do i hold in temperature?
if the cap of saggar is not closed correctly, may it cause any problem????
thank you

put the oxides in the sawdust and not on the bottom of the saggar. Mix the oxides with salt.put your pot on a chunk of brick above the combustibles.
You hold the temperature by cutting back on your fuel and watching it with a pyrometer.
The cap of the saggar should be tight.
Marcia

#7 naghmeh

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Posted 10 September 2012 - 01:59 AM


my saggar is a vase 40cm hight and 3ocm diameter, 2cm thickness..... i lay oxides at the bottom and set my works and put sawdust between them, i didn't use salt...
do i use salt top of saggar????
do i put oxides in the special place or i can pour at the bottom of saggar and top of the works?????
do i hold in temperature?
if the cap of saggar is not closed correctly, may it cause any problem????
thank you

put the oxides in the sawdust and not on the bottom of the saggar. Mix the oxides with salt.put your pot on a chunk of brick above the combustibles.
You hold the temperature by cutting back on your fuel and watching it with a pyrometer.
The cap of the saggar should be tight.
Marcia





your descriptions are very nice and understandable, I'll do it surely... but in the last part, I have electric kiln, so the source of heat is scattered through all sides, how should I deal with this ?
thank you

#8 naghmeh

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Posted 10 September 2012 - 02:00 AM

your descriptions are very nice and understandable, I'll do it surely... but in the last part, I have electric kiln, so the source of heat is scattered through all sides, how should I deal with this ?
thank you

#9 Marcia Selsor

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Posted 10 September 2012 - 02:36 AM

your descriptions are very nice and understandable, I'll do it surely... but in the last part, I have electric kiln, so the source of heat is scattered through all sides, how should I deal with this ?
thank you

Unless you are willing to change your elements more frequently, do not use salts in an electric kiln. My friend , Russel Fouts , fires saggaars in electric kiln and has published articles about it. he does not use salts. Please google his articles. One is called "yes you can"
it was in Pottery Making illustrated. his website is mes-Potes

I fire mine in my raku kiln with gas.
the saggaars are sealed.
russel fires in his electric. has not change his elements in 15 years. Currently he is using a hard brick saggar and adds charcoal inside.
he has written about using aluminum foil to wrap pieces rather than using the traditional saggar idea. I think you would benefit to read some of his ideas.
Marcia

#10 naghmeh

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Posted 10 September 2012 - 03:57 AM


your descriptions are very nice and understandable, I'll do it surely... but in the last part, I have electric kiln, so the source of heat is scattered through all sides, how should I deal with this ?
thank you

Unless you are willing to change your elements more frequently, do not use salts in an electric kiln. My friend , Russel Fouts , fires saggaars in electric kiln and has published articles about it. he does not use salts. Please google his articles. One is called "yes you can"
it was in Pottery Making illustrated. his website is mes-Potes

I fire mine in my raku kiln with gas.
the saggaars are sealed.
russel fires in his electric. has not change his elements in 15 years. Currently he is using a hard brick saggar and adds charcoal inside.
he has written about using aluminum foil to wrap pieces rather than using the traditional saggar idea. I think you would benefit to read some of his ideas.
Marcia




i get it... thank you for your help

#11 naghmeh

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Posted 13 August 2013 - 04:46 AM

i want to know about expose ceramic body outdoor and how to prevent this... who call tell me or introduce sources? 



#12 Marcia Selsor

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Posted 13 August 2013 - 06:45 AM

do you mean fading colors or freezing?

Marcia

#13 naghmeh

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Posted 14 August 2013 - 02:24 AM

actually i have to write an article and i should tell about EXPOSE CERAMIC BODY IN ENVIROMENT ... now i think both of them . fading and freezing

thank you for your answer



#14 naghmeh

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Posted 14 August 2013 - 02:32 AM

one more thigs... i dont find new post option to write new topic,,, do you know where is it? i don't see it



#15 oldlady

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Posted 14 August 2013 - 09:24 AM

look at the top of the page, right corner, black square with "Start new topic".  this is only on the top of the list of what is under the headings,  IN THE STUDIO, CLAY AND GLAZE TECHNICAL,  etc.


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